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求助我和网上找来的代码大同小异,提交之后他的每次都AC,我把数据和语句风格改的都跟他差不多了但还是WA……rp#include <iostream> //这是他的 #include <ctime> using namespace std; long n,i,j,m,s,k,a[505][505],b[505][505],c[505][505],sum; int main() { srand((unsigned)time(0));//初始化随机函数 while(cin>>n) { k=0; for(i=0;i<n;i++) for(j=0;j<n;j++) scanf("%d",&a[i][j]); for(i=0;i<n;i++) for(j=0;j<n;j++) scanf("%d",&b[i][j]); for(i=0;i<n;i++) for(j=0;j<n;j++) scanf("%d",&c[i][j]); for(s=0;s<60000;s++) //随机次数越多越准确 { j=rand()%n; //随机抽取行列 i=rand()%n; sum=0; for(m=0;m<n;m++) sum+=a[i][m]*b[m][j]; if(c[i][j]!=sum) { k=1;break;} } if(k==1) cout<<"NO"<<endl; else cout<<"YES"<<endl; } return 0; } #include<iostream> //这是我的 #include<ctime> using namespace std; int main() { int n; srand((unsigned int)time(0)); long int a[505][505],b[505][505],d[505][505]; int i,j; while(cin>>n) { int t=60000,flag=0; for(i=0;i<n;i++) for(j=0;j<n;j++) scanf("%d",&a[i][j]); for(i=0;i<n;i++) for(j=0;j<n;j++) scanf("%d",&b[i][j]); for(i=0;i<n;i++) for(j=0;j<n;j++) scanf("%d",&d[i][j]); int r,c; while (t) { r=rand()%n; c=rand()%n; long int temp=0; for(i=0;i<n;i++) { temp+=a[r][i]*b[i][c]; } if(temp!=d[r][c]) {flag=1; break;} t--; } if(flag) { cout<<"NO"<<endl; } else cout<<"YES"<<endl; } return 0; } Followed by:
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