Saturday, June 15, 2024

# Codeforces Round #382 (Div. 1), problem: (D) Permutations Solution in C/C++

```#include <bits/stdc++.h>
using namespace std;

const int N=2e3+1;

int n,m,x[N*N],y[N*N];
bitset<N*2> a[N];

int main() {
scanf("%d%d",&n,&m);
for(int i=1;i<=m;i++) {
scanf("%d%d",x+i,y+i);
x[i]--; y[i]--;
a[x[i]].set(y[i]);
}
for(int i=0;i<n;i++) a[i][i+n]=1;
for(int i=0;i<n;i++) {
for(int j=i;j<n;j++) {
if(a[j][i]) {
swap(a[j],a[i]);
break;
}
}
for(int j=0;j<n;j++) {
if(j!=i&&a[j][i]) a[j]^=a[i];
}
}
for(int i=1;i<=m;i++) {
if(a[y[i]][n+x[i]]) puts("NO");
else puts("YES");
}
}```

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