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- #include <iostream>
- #include <cstdio>
- #include <cstdlib>
- using namespace std;
- int main(){
- int i,j,n,k;
- int a[500][500];
- cin >>n;
- for(i=1;i<=n;i++){
- for(j=1;j<=n;j++){
- cin >>a[i][j];
- }
- }
- k=0;
- for(i=1; i<=n-1; i++){
- for(j=i+1; j<=n; j++){
- if (a[i][j]==1) k++;
- }
- }
- cout <<k;
- return 0;
- /*int i,n,m,l,k;
- int c[5000], a[5000], b[5000];
- cin >>n >>m;
- k=0;
- for(i=1;i<=n;i++){
- c[i]=0;
- }
- //cout <<endl;
- for(i=1;i<=m;i++){
- cin >>a[i] >>b[i];
- if(c[a[i]]==0 && c[b[i]]==0){
- k++;
- }
- c[a[i]]=1;
- c[b[i]]=1;
- }
- for(i=1;i<=n;i++){
- if(c[i]==0) k++;
- }
- cout <<k;
- return 0;*/
- }
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