func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, a[200005], sum;   int main() {     cin >> n;     for (int i = 1; i <= n; i++) cin >> a[i], sum ^= a[i];     if (n % 2 == 0) {       if (sum) {         puts( NO );         return 0;       }       n--;     }     puts( YES );     printf( %d n , n - 1);     for (int i = 1; i <= n - 2; i += 2) printf( %d %d %d n , i, i + 1, i + 2);     for (int i = 1; i <= n - 2; i += 2) printf( %d %d %d n , i, i + 1, n);   }   