func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 300010;   long long n, a[N], t;   map<long long, bool> vis;   int solve() {     scanf( %lld , &t);     while (t--) {       scanf( %lld , &n);       vis.clear();       bool imp = 0;       for (int i = 1; i <= n; i++) {         scanf( %lld , &a[i]);         long long nw = (i + a[i]) % n;         if (nw < 0) nw += n;         if (vis[nw]) {           imp = 1;         }         vis[nw] = 1;       }       if (imp)         printf( NO n );       else         printf( YES n );     }     return 0;   }   int main() { return solve(); }   