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@@ -0,0 +1,29 @@
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+#include<bits/stdc++.h>
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+using namespace std;
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+int main(){
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+ int n;
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+ while(cin >> n){
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+ int a[n][n];
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+ for(int i = 0; i < n; i++){
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+ for(int j = 0; j < n; j++){
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+ cin >> a[i][j];
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+ }
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+ }
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+ int flag = 0;
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+ for(int i = 0; i < n; i++){
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+ for(int j = 0; j < i; j++){
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+ if(a[i][j] != a[j][i]){
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+ flag = 1;
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+ break;
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+ }
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+ }
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+ if(flag == 1)break;
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+ }
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+ if(flag == 1){
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+ cout << "No!" << endl;
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+ }else {
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+ cout << "Yes!" << endl;
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+ }
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+ }
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+ return 0;
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+}
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