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- #include<iostream>
- using namespace std;
- #include<vector>
- #include<time.h>
- #define N 40000
- int main(){
- vector<vector<int>> x(N);
- for (int i = 0; i < N; i++)
- x[i].resize(N,1);
- clock_t t=clock();
- int s=0;
- for (int i = 0; i < N; i++)
- for(int j=0;j<N;j++)
- s=s+x[i][j];
- t=clock()-t;
- float r=t;
- cout<<r/float(1000000)<<endl;
- return 0;
- }
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