func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 1010;   int n, m, a[MAXN];   int main() {     cin.tie(0);     int T;     cin >> T;     while (T--) {       int ans = 0;       cin >> n >> m;       for (register int i = 1; i <= n; ++i) cin >> a[i];       if (n > m || n == 2) {         puts( -1 );         continue;       }       for (register int i = 1; i <= n; ++i) ans += a[i] + a[i];       m -= n;       int minn1 = 0x3f3f3f3f, minn2 = 0x3f3f3f3f, p1, p2;       for (register int i = 1; i <= n; ++i) {         if (a[i] < minn1)           p2 = p1, p1 = i, minn2 = minn1, minn1 = a[i];         else if (a[i] < minn2)           minn2 = a[i], p2 = i;       }       ans += m * (minn1 + minn2);       printf( %d n , ans);       for (register int i = 1; i <= m; ++i) printf( %d %d n , p1, p2);       for (register int i = 2; i <= n; ++i) printf( %d %d n , i, i - 1);       printf( 1 %d n , n);     }     return 0;   }   