Bruce\u662fK\u56fd\u7684\u5546\u4eba\uff0c\u4ed6\u5728A\u5dde\u6210\u7acb\u4e86\u81ea\u5df1\u7684\u516c\u53f8\uff0c\u8fd9\u6b21\u4ed6\u7684\u516c\u53f8\u751f\u4ea7\u51fa\u4e86\u4e00\u6279\u6027\u80fd\u5f88\u597d\u7684\u4ea7\u54c1\uff0c\u51c6\u5907\u5ba3\u4f20\u6d3b\u52a8\u5f00\u59cb\u540e\u7684\u7b2cL\u5929\u5230\u8fbeB\u5dde\u8fdb\u884c\u65b0\u54c1\u62cd\u5356\uff0c\u671f\u95f4Bruce\u6253\u7b97\u5c06\u4ea7\u54c1\u62ff\u5230\u5404\u4e2a\u5dde\u53bb\u505a\u63a8\u9500\u5ba3\u4f20,\u4ee5\u589e\u52a0\u5176\u5f71\u54cd\u529b\u3002<\/p>\n
K\u56fd\u6709\u5f88\u591a\u4e2a\u5dde,\u6bcf\u4e2a\u5dde\u90fd\u4e0e\u5176\u4ed6\u4e00\u4e9b\u5dde\u76f8\u90bb,\u4f46\u662fK\u56fd\u5bf9\u5546\u4eba\u4f5c\u5ba3\u4f20\u5374\u6709\u4e00\u4e9b\u5f88\u5947\u602a\u7684\u89c4\u5b9a\uff1a
\n\t1\u3001 \u5546\u4eba\u53ea\u80fd\u4ece\u67d0\u4e9b\u5dde\u5230\u8fbe\u53e6\u5916\u4e00\u4e9b\u5dde\uff0c\u5373\u8fde\u901a\u8def\u7ebf\u662f\u5355\u5411\u7684\uff0c\u800c\u4e14\u6709\u4e9b\u5dde\u53ef\u80fd\u662f\u5230\u8fbe\u4e0d\u4e86\u7684\u3002
\n\t2\u3001 \u5546\u4eba\u4e0d\u5141\u8bb8\u5728\u540c\u4e00\u4e2a\u5dde\u8fde\u7eed\u5ba3\u4f20\u4e24\u5929\u6216\u4ee5\u4e0a\uff0c\u6bcf\u5929\u5ba3\u4f20\u5b8c\u5fc5\u987b\u79bb\u5f00\u8be5\u5dde\u3002
\n\t3\u3001 \u5546\u4eba\u53ef\u4ee5\u591a\u6b21\u6765\u5230\u540c\u4e00\u4e2a\u5dde\u8fdb\u884c\u5ba3\u4f20\u3002<\/p>\n
"\u6211\u5fc5\u987b\u627e\u51fa\u4e00\u6761\u5f71\u54cd\u529b\u6700\u5927\u7684\u8def\u7ebf\u624d\u884c"\uff0cBruce\u60f3\uff0c"\u4f46\u6211\u9996\u5148\u5fc5\u987b\u77e5\u9053\u5230\u5e95\u6709\u591a\u5c11\u8fd9\u79cd\u7b26\u5408\u89c4\u5b9a\u7684\u5ba3\u4f20\u8def\u7ebf\u53ef\u4f9b\u6211\u9009\u62e9\u3002"\u73b0\u5728Bruce\u628a\u4efb\u52a1\u4ea4\u7ed9\u4e86\u4f60\u3002\u5e76\u4e14\u51fa\u4e8e\u8003\u8651\u4ee5\u540e\u7684\u9700\u8981\uff0c\u4f60\u8fd8\u8981\u5e2e\u4ed6\u7b97\u51fa\u7ed9\u51fa\u7684\u4e24\u5dde\u4e4b\u95f4\u7684\u8def\u7ebf\u7684\u603b\u6570\u3002<\/p>\n
<\/p>\n
\u8f93\u5165\u6587\u4ef6\u7b2c\u4e00\u884c\u5305\u542b\u4e09\u4e2a\u6574\u6570n,m,L\uff081≤n,L≤100\uff09\uff0c\u5206\u522b\u8868\u793aK\u56fd\u7684\u5dde\u6570\u3001\u8fde\u901a\u8def\u7ebf\u7684\u6570\u91cf\uff0c\u4ee5\u53ca\u591a\u5c11\u5929\u540e\u5fc5\u987b\u5230\u8fbeB\u5dde\u3002\u63a5\u4e0b\u6765\u6709m\u884c\uff0c\u6bcf\u884c\u4e00\u961f\u6574\u6570x,y\uff081≤x,y≤n\uff09\uff0c\u8868\u793a\u5546\u4eba\u80fd\u4ecex\u5dde\u5230\u8fbey\u5dde\u3002
\n\t\u7b2cm+2\u884c\u4e3a\u4e00\u4e2a\u6574\u6570q\uff081≤q≤100\uff09\uff0c\u8868\u793aBruce\u6709q\u4e2a\u8be2\u95ee\u3002\u4e0b\u9762q\u884c\u6bcf\u884c\u4e24\u4e2a\u6574\u6570A,B\uff081≤A,B≤n\uff09\uff0c\u5373A\u3001B\u5dde\u7684\u4f4d\u7f6e\u3002<\/p>\n
\u8f93\u51fa\u6587\u4ef6\u5305\u542bq\u884c\uff0c\u6bcf\u884c\u4e00\u4e2a\u6574\u6570t\uff0c\u4e3a\u6240\u6c42\u7684\u4eceA\u5dde\u5230B\u5dde\u6ee1\u8db3\u4e0a\u8ff0\u89c4\u5b9a\u7684\u8def\u7ebf\u603b\u6570\u3002 1. \u539f\u9898\u4e2d\u6587\u5927\u610f.<\/p>\n \u5546\u4eba\u7684\u5ba3\u4f20\u5373\u662f\u4e00\u4e2a\u6709\u5411\u56fe\u7684\u95ee\u9898\u3002\u6709\u4e00\u4e2a\u6709\u5411\u56fe\u3002\u8be5\u56fe\u7684\u6bcf\u6761\u4ef6\u6743\u91cd\u4e00\u6837\uff0c\u4ece\u56fe\u4e2d\u4efb\u610f\u4e00\u70b9a\u521a\u597d\u901a\u8fc7<\/span>L<\/span>\u6b65\u5230\u8fbe\u53e6\u4e00\u70b9<\/span>b<\/span>\u6709\u591a\u5c11\u6761\u8def\u7ebf\u3002<\/span><\/p>\n <\/p>\n <\/p>\n 2. \u7b97\u6cd5\u601d\u60f3\u53ca\u89e3\u9898\u601d\u8def.<\/p>\n \u4f7f\u7528\u4e86\u52a8\u6001\u89c4\u5212\u7b97\u6cd5\u3002\u4ee4 dp[num][dest] \u8868\u793a\u4ece\u8d77\u70b9\u901a\u8fc7 <\/span>num <\/span>\u6761\u8fb9\u5230\u8fbe\u7ec8\u70b9\u5171\u6709\u591a\u5c11\u79cd\u8d70\u6cd5\u3002<\/span><\/p>\n \u5148\u7531\u5df2\u7ecf\u77e5\u6761\u4ef6\u6613\u5f97\u4ece\u8d77\u70b9\u901a\u8fc7\u4e00\u6761\u5b83\u7684\u90bb\u63a5\u8fb9\u5230\u8fbe\u5b83\u7684\u6240\u6709\u90bb\u63a5\u70b9\u5171\u6709\u4e00\u6761\u8def\u7ebf\u3002\u5373 dp[1][\u90bb\u63a5\u70b9<\/span>] <\/span>\u6613\u6c42\u5f97\u3002\u800c <\/span>dp[x][y] = sum( dp[x-1][<\/span>\u53ef\u4ee5\u4e00\u6761\u90bb\u63a5\u8fb9\u5230\u8fbe<\/span>y<\/span>\u7684\u70b9<\/span>] )<\/span>\u3002<\/span><\/p>\n <\/p>\n 3. \u4e3b\u8981\u6570\u6570\u636e\u7ed3\u6784.<\/span><\/p>\n \u4e3b\u8981\u6570\u636e\u7ed3\u6784\u4e3a\u4e09\u4e2a\u6570\u7ec4\u3002\u8fd9\u672c\u4e2a\u6570\u7ec4\u90fd\u4e0d\u7528\u4e0b\u6807\u4e3a0<\/span>\u7684\u5143\u7d20\u3002<\/span><\/p>\n char odgree[MAX_VERTICES_NUM+1];<\/p>\n \u4e0b\u6807\u4e3a\u6bcf\u4e2a\u9876\u70b9\u7684\u7f16\u53f7.<\/span>\u8868\u793a\u6bcf\u4e2a\u9876\u70b9\u7684\u51fa\u5ea6<\/span>. <\/span><\/p>\n int routine[MAX_VERTICES_NUM+1][MAX_VERTICES_NUM+1];<\/p>\n ‘\u8def\u7531\u8868’ routine[x][n] = y <\/span>\u8868\u793a\u4ece\u9876\u70b9<\/span>x<\/span>\u7ecf\u5b83\u7684\u7b2c<\/span>n<\/span>\u6761\u90bb\u63a5\u8fb9\u53ef\u4ee5\u5230\u8fbe\u9876\u70b9<\/span>y.<\/span><\/p>\n int dp[MAX_VERTICES_NUM+1][MAX_VERTICES_NUM+1];<\/p>\n \u8fd9\u4e2a\u6570\u7ec4\u5373\u7b2c\u4e8c\u8282\u63d0\u5230\u7684dp<\/span>\u6570\u7ec4\uff0c<\/span>dp[L][x] = num<\/span>\u4ece\u8d77\u70b9\u5f00\u59cb\u7ecf<\/span>L<\/span>\u6761\u8fb9\u8d70\u5230\u9876\u70b9 <\/span>x <\/span>\u5171\u6709 <\/span>num <\/span>\u79cd\u8d70\u6cd5\u3002<\/span><\/p>\n <\/p>\n 4. \u9010\u6b65\u6c42\u7cbe\u7b97\u6cd5\u63cf\u8ff0\uff08\u542b\u8fc7\u7a0b\u53ca\u53d8\u91cf\u8bf4\u660e\uff09;<\/span><\/p>\n \u4ece\u5df2\u77e5\u6761\u4ef6\u521d\u59cb\u5316 odgree <\/span>\u548c <\/span>routine <\/span>\u6570\u7ec4<\/span>.<\/span><\/p>\n <\/p>\n 5. \u7a0b\u5e8f\u6ce8\u91ca\u6e05\u5355<\/p>\n <\/p>\n 6. \u6d4b\u8bd5\u6570\u636e<\/p>\n 4 5 6<\/p>\n 1 2<\/p>\n 2 3<\/p>\n 3 4<\/p>\n 4 1<\/p>\n 2 4<\/p>\n 5<\/p>\n 1 4<\/p>\n 4 2<\/p>\n 2 1<\/p>\n 1 3<\/p>\n 3 4<\/p>\n 2<\/p>\n 1<\/p>\n 2<\/p>\n 1<\/p>\n 0<\/p>\n <\/p>\n <\/p>\n 7. \u5bf9\u65f6\u95f4\u590d\u6742\u5ea6\uff0c\u7a7a\u95f4\u590d\u6742\u5ea6\u65b9\u9762\u7684\u5206\u6790\u3001\u4f30\u7b97\u53ca\u7a0b\u5e8f\u4f18\u5316\u7684\u5206\u6790\u548c\u6539\u8fdb.<\/span><\/p>\n \u672c\u89e3\u51b3\u65b9\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(L*n*n)\uff0c\u7a7a\u95f4\u590d\u6742\u5ea6\u4e3a<\/span>O(n*n).<\/span><\/p>\n \u7528\u52a8\u6001\u89c4\u5212\u89e3\u6b64\u9898\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4f18\u4e8e\u7528\u90bb\u63a5\u77e9\u9635\u8868\u793a\u56fe\u7136\u540e\u7528\u56fe\u7684\u4e58\u6cd5\u89e3\u51fa\u3002\u540e\u8005\u7684\u65f6\u95f4\u590d\u6742\u5fd7\u4e3aO(L*n*n*n)<\/span>\u3002<\/span><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":" Description Bruce\u662fK\u56fd\u7684\u5546\u4eba\uff0c\u4ed6\u5728A\u5dde\u6210\u7acb\u4e86\u81ea\u5df1\u7684\u516c\u53f8\uff0c\u8fd9\u6b21\u4ed6\u7684\u516c\u53f8\u751f\u4ea7\u51fa\u4e86\u4e00\u6279\u6027\u80fd\u5f88\u597d\u7684\u4ea7\u54c1\uff0c\u51c6\u5907\u5ba3\u4f20\u6d3b\u52a8\u5f00\u59cb\u540e\u7684\u7b2cL\u5929\u5230\u8fbeB\u5dde\u8fdb\u884c\u65b0\u54c1\u62cd\u5356\uff0c\u671f\u95f4Bruce\u6253\u7b97\u5c06\u4ea7\u54c1\u62ff\u5230\u5404\u4e2a\u5dde\u53bb\u505a\u63a8\u9500\u5ba3\u4f20,\u4ee5\u589e\u52a0\u5176\u5f71\u54cd\u529b\u3002 K\u56fd\u6709\u5f88\u591a\u4e2a\u5dde,\u6bcf\u4e2a\u5dde\u90fd\u4e0e\u5176\u4ed6\u4e00\u4e9b\u5dde\u76f8\u90bb,\u4f46\u662fK\u56fd\u5bf9\u5546\u4eba\u4f5c\u5ba3\u4f20\u5374\u6709\u4e00\u4e9b\u5f88\u5947\u602a\u7684\u89c4\u5b9a\uff1a 1\u3001 \u5546\u4eba\u53ea\u80fd\u4ece\u67d0\u4e9b\u5dde\u5230\u8fbe\u53e6\u5916\u4e00\u4e9b\u5dde\uff0c\u5373\u8fde\u901a\u8def\u7ebf\u662f\u5355\u5411\u7684\uff0c\u800c\u4e14\u6709\u4e9b\u5dde\u53ef\u80fd\u662f\u5230\u8fbe\u4e0d\u4e86\u7684\u3002 2\u3001 \u5546\u4eba\u4e0d\u5141\u8bb8\u5728\u540c\u4e00\u4e2a\u5dde\u8fde\u7eed\u5ba3\u4f20\u4e24\u5929\u6216\u4ee5\u4e0a\uff0c\u6bcf\u5929\u5ba3\u4f20\u5b8c\u5fc5\u987b\u79bb\u5f00\u8be5\u5dde\u3002 3\u3001 \u5546\u4eba\u53ef\u4ee5\u591a\u6b21\u6765\u5230\u540c\u4e00\u4e2a\u5dde\u8fdb\u884c\u5ba3\u4f20\u3002 "\u6211\u5fc5\u987b\u627e\u51fa\u4e00\u6761\u5f71\u54cd\u529b\u6700\u5927\u7684\u8def\u7ebf\u624d\u884c"\uff0cBruce\u60f3\uff0c"\u4f46\u6211\u9996\u5148\u5fc5\u987b\u77e5\u9053\u5230\u5e95\u6709\u591a\u5c11\u8fd9\u79cd\u7b26\u5408\u89c4\u5b9a\u7684\u5ba3\u4f20\u8def\u7ebf\u53ef\u4f9b\u6211\u9009\u62e9\u3002"\u73b0\u5728Bruce\u628a\u4efb\u52a1\u4ea4\u7ed9\u4e86\u4f60\u3002\u5e76\u4e14\u51fa\u4e8e\u8003\u8651\u4ee5\u540e\u7684\u9700\u8981\uff0c\u4f60\u8fd8\u8981\u5e2e\u4ed6\u7b97\u51fa\u7ed9\u51fa\u7684\u4e24\u5dde\u4e4b\u95f4\u7684\u8def\u7ebf\u7684\u603b\u6570\u3002 Input \u8f93\u5165\u6587\u4ef6\u7b2c\u4e00\u884c\u5305\u542b\u4e09\u4e2a\u6574\u6570n,m,L\uff081≤n,L≤100\uff09\uff0c\u5206\u522b\u8868\u793aK\u56fd\u7684\u5dde\u6570\u3001\u8fde\u901a\u8def\u7ebf\u7684\u6570\u91cf\uff0c\u4ee5\u53ca\u591a\u5c11\u5929\u540e\u5fc5\u987b\u5230\u8fbeB\u5dde\u3002\u63a5\u4e0b\u6765\u6709m\u884c\uff0c\u6bcf\u884c\u4e00\u961f\u6574\u6570x,y\uff081≤x,y≤n\uff09\uff0c\u8868\u793a\u5546\u4eba\u80fd\u4ecex\u5dde\u5230\u8fbey\u5dde\u3002 \u7b2cm+2\u884c\u4e3a\u4e00\u4e2a\u6574\u6570q\uff081≤q≤100\uff09\uff0c\u8868\u793aBruce\u6709q\u4e2a\u8be2\u95ee\u3002\u4e0b\u9762q\u884c\u6bcf\u884c\u4e24\u4e2a\u6574\u6570A,B\uff081≤A,B≤n\uff09\uff0c\u5373A\u3001B\u5dde\u7684\u4f4d\u7f6e\u3002 Output \u8f93\u51fa\u6587\u4ef6\u5305\u542bq\u884c\uff0c\u6bcf\u884c\u4e00\u4e2a\u6574\u6570t\uff0c\u4e3a\u6240\u6c42\u7684\u4eceA\u5dde\u5230B\u5dde\u6ee1\u8db3\u4e0a\u8ff0\u89c4\u5b9a\u7684\u8def\u7ebf\u603b\u6570\u3002 \u8f93\u5165\u6570\u636e\u4e2d\u7684\u8be2\u95ee\u5c06\u4fdd\u8bc1\u7b54\u6848t\u5728\u957f\u6574\u6570\u8303\u56f4\u5185\uff0c\u5373t<231\u3002 Sample Input 4 5 6 1 2 2 3 3 4 4 1 2 4 2 1 4 4 2 Sample Output 2 1 1. \u539f\u9898\u4e2d\u6587\u5927\u610f. \u5546\u4eba\u7684\u5ba3\u4f20\u5373\u662f\u4e00\u4e2a\u6709\u5411\u56fe\u7684\u95ee\u9898\u3002\u6709\u4e00\u4e2a\u6709\u5411\u56fe\u3002\u8be5\u56fe\u7684\u6bcf\u6761\u4ef6\u6743\u91cd\u4e00\u6837\uff0c\u4ece\u56fe\u4e2d\u4efb\u610f\u4e00\u70b9a\u521a\u597d\u901a\u8fc7L\u6b65\u5230\u8fbe\u53e6\u4e00\u70b9b\u6709\u591a\u5c11\u6761\u8def\u7ebf\u3002 2. \u7b97\u6cd5\u601d\u60f3\u53ca\u89e3\u9898\u601d\u8def. \u4f7f\u7528\u4e86\u52a8\u6001\u89c4\u5212\u7b97\u6cd5\u3002\u4ee4 dp[num][dest] \u8868\u793a\u4ece\u8d77\u70b9\u901a\u8fc7 num \u6761\u8fb9\u5230\u8fbe\u7ec8\u70b9\u5171\u6709\u591a\u5c11\u79cd\u8d70\u6cd5\u3002 \u5148\u7531\u5df2\u7ecf\u77e5\u6761\u4ef6\u6613\u5f97\u4ece\u8d77\u70b9\u901a\u8fc7\u4e00\u6761\u5b83\u7684\u90bb\u63a5\u8fb9\u5230\u8fbe\u5b83\u7684\u6240\u6709\u90bb\u63a5\u70b9\u5171\u6709\u4e00\u6761\u8def\u7ebf\u3002\u5373 dp[1][\u90bb\u63a5\u70b9] \u6613\u6c42\u5f97\u3002\u800c dp[x][y] = sum( dp[x-1][\u53ef\u4ee5\u4e00\u6761\u90bb\u63a5\u8fb9\u5230\u8fbey\u7684\u70b9] )\u3002 3. \u4e3b\u8981\u6570\u6570\u636e\u7ed3\u6784. \u4e3b\u8981\u6570\u636e\u7ed3\u6784\u4e3a\u4e09\u4e2a\u6570\u7ec4\u3002\u8fd9\u672c\u4e2a\u6570\u7ec4\u90fd\u4e0d\u7528\u4e0b\u6807\u4e3a0\u7684\u5143\u7d20\u3002 char odgree[MAX_VERTICES_NUM+1]; \u4e0b\u6807\u4e3a\u6bcf\u4e2a\u9876\u70b9\u7684\u7f16\u53f7.\u8868\u793a\u6bcf\u4e2a\u9876\u70b9\u7684\u51fa\u5ea6. int routine[MAX_VERTICES_NUM+1][MAX_VERTICES_NUM+1]; ‘\u8def\u7531\u8868’ routine[x][n] = y \u8868\u793a\u4ece\u9876\u70b9x\u7ecf\u5b83\u7684\u7b2cn\u6761\u90bb\u63a5\u8fb9\u53ef\u4ee5\u5230\u8fbe\u9876\u70b9y. int dp[MAX_VERTICES_NUM+1][MAX_VERTICES_NUM+1]; \u8fd9\u4e2a\u6570\u7ec4\u5373\u7b2c\u4e8c\u8282\u63d0\u5230\u7684dp\u6570\u7ec4\uff0cdp[L][x] = num\u4ece\u8d77\u70b9\u5f00\u59cb\u7ecfL\u6761\u8fb9\u8d70\u5230\u9876\u70b9 x \u5171\u6709 num \u79cd\u8d70\u6cd5\u3002 … Continue reading “\u4e2d\u5927ACM\u9898.\u5546\u4eba\u7684\u5ba3\u4f20\u89e3\u9898\u62a5\u544a.”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[108],"class_list":["post-243","post","type-post","status-publish","format-standard","hentry","category-tech_articles","tag-108"],"_links":{"self":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/posts\/243","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=243"}],"version-history":[{"count":0,"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/posts\/243\/revisions"}],"wp:attachment":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=243"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=243"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=243"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n\t\u8f93\u5165\u6570\u636e\u4e2d\u7684\u8be2\u95ee\u5c06\u4fdd\u8bc1\u7b54\u6848t\u5728\u957f\u6574\u6570\u8303\u56f4\u5185\uff0c\u5373t<231<\/sup>\u3002<\/p>\nSample Input<\/h1>\n
4 5 6\n1 2\n2 3\n3 4\n4 1\n2 4\n2\n1 4\n4 2<\/pre>\n
Sample Output<\/h1>\n
2 1<\/pre>\n
bzero(odgree, sizeof(odegree));\n\nfor(int x,y, i = 0; i < m; i++)\n\n{\n\nscanf("%d %d", &x, &y);\n\nodgree[x]++;\n\nroutine[x][ odgree[x] ] = y;\n\n}\n\n\n\n\u4e0b\u9762\u7684cal\u51fd\u6570\u8f93\u5165\u8d77\u70b9\u9876\u70b9\u548c\u7ec8\u70b9\u9876\u70b9\uff0c\u8fd4\u56de\u5171\u6709\u591a\u5c11\u79cd\u8d70\u6cd5\u3002\n\nint cal(char start, char dest)\n\n{\n\nmemset(dp, 0, sizeof(dp));\n\n\n\nfor ( int i = 1; i <= odgree[start]; i++ ) \/\/ \u904d\u5386\u8d77\u70b9\u7684\u6bcf\u4e00\u6761\u90bb\u63a5\u8fb9\n\n{\n\ndp[1][ routine[start][i] ]++; \/\/ \u521d\u59cb\u65f6\u7ecf\u8fc7\u4e00\u90bb\u63a5\u8fb9\u5230\u8fbe\u522b\u4e00\u70b9\u7684\u8d70\u6cd5\u6709\u51e0\u79cd.\n\n\n\n}\n\n\n\nfor ( int i = 2; i <= L; i++ ) \/\/ \u4e00\u76f4\u8d70\u5230\u7b2cL\u6b65.\n\n{\n\nfor ( int j = 1; j <= n; j++ ) \/\/ \u904d\u5386\u6bcf\u4e00\u4e2a\u9876\u70b9.\n\n{\n\nfor ( int k = 1; k <= odgree[j]; k++ ) \/\/ \u8be5\u9876\u70b9\u7684\u7b2c\u4e00\u6761\u90bb\u63a5\u8fb9\n\n{\n\n\/\/ \u4e0a\u6587\u63d0\u5230\u7684\u9012\u63a8\u516c\u5f0f\u3002\n\ndp[i][ routine[j][k] ] += dp[i-1][j];\n\n}\n\n}\n\n}\n\n\n\nreturn dp[L][dest]; \/\/ \u8fd4\u56de\u7ed3\u679c\n\n}<\/pre>\n#include <cstdio>\n\n#include <cstdlib>\n\n#include <memory>\n\n#include <cstring>\n\n#include <vector>\n\n\n\nusing namespace std;\n\n\n\nconst int MAX_VERTICES_NUM = 100; \/\/ \u6700\u591a\u591a\u5c11\u4e2a\u9876\u70b9.\n\nint n, m, L, q; \/\/ \u5b9e\u9645n\u4e2a\u70b9\u3001m\u6761\u8fb9\uff0cL \u4e3a\u671f\u9650.q\u4e3a\u6709\u591a\u5c11\u4e2a\u8be2\u95ee.\n\nstatic char odgree[MAX_VERTICES_NUM+1]; \/\/ \u8bb0\u6bcf\u4e2a\u70b9\u7684\u51fa\u5ea6.\u4e0d\u7528\u4e0b\u6807\u4e3a0\u7684\u5143\u7d20.\n\nstatic int routine[MAX_VERTICES_NUM+1][MAX_VERTICES_NUM+1]; \/\/ table[x][y] \u8868\u793ax\u70b9\u7ecf\u5b83\u7684\u7b2cy\u6761\u8fb9\u53ef\u4ee5\u53bb\u5230\u54ea\u4e2a\u70b9.\n\nstatic int dp[MAX_VERTICES_NUM+1][MAX_VERTICES_NUM+1]; \/\/ dp[x][y] \u8868\u793a\u7ecfx\u6761\u8fb9\uff0c\u53ef\u4ee5\u4ece\u67d0\u70b9\u5230 y \u70b9.\n\n\n\nint cal(char start, char dest)\n\n{\n\nmemset(dp, 0, sizeof(dp));\n\n\n\nfor ( int i = 1; i <= odgree[start]; i++ ) \/\/ \u904d\u5386\u8d77\u70b9\u7684\u6bcf\u4e00\u6761\u90bb\u63a5\u8fb9.\n\n{\n\ndp[1][ routine[start][i] ]++; \/\/ \u521d\u59cb\u65f6\u7ecf\u8fc7\u4e00\u6b65\u5230\u8fbe\u522b\u4e00\u70b9\u7684\u8d70\u6cd5.\n\n}\n\n\n\nfor ( int i = 2; i <= L; i++ ) \/\/ \u4e00\u76f4\u8d70\u5230\u7b2c L \u6b65.\n\n{\n\nfor ( int j = 1; j <= n; j++ ) \/\/ \u904d\u5386\u6bcf\u4e00\u4e2a\u70b9.\n\n{\n\nfor ( int k = 1; k <= odgree[j]; k++ ) \/\/ \u8be5\u70b9\u7684\u6bcf\u4e00\u4e2a\u90bb\u63a5\u70b9.\n\n{\n\ndp[i][ routine[j][k] ] += dp[i-1][j];\n\n}\n\n}\n\n}\n\n\n\nreturn dp[L][dest];\n\n}\n\n\n\nint main(int argc, char* argv[])\n\n{\n\nwhile ( EOF != scanf("%d %d %d", &n, &m, &L) )\n\n{\n\nmemset(odgree, 0, sizeof(odgree));\n\nfor(int x,y, i = 0; i < m; i++)\n\n{\n\nscanf("%d %d", &x, &y);\n\nodgree[x]++;\n\nroutine[x][ odgree[x] ] = y;\n\n}\n\n\n\nscanf("%d", &q);\n\nvector<int> results;\n\nfor ( int start,dest, i = 0; i < q; i++)\n\n{\n\nscanf("%d %d", &start, &dest);\n\nresults.push_back(cal(start, dest));\n\n}\n\nfor ( int i = 0; i < results.size(); i++ )\n\n{\n\nprintf("%d\\n", results[i]);\n\n}\n\n\n\n}\n\nreturn 0;\n\n}\n<\/pre>\n