func_code_string: #include <bits/stdc++.h>   using namespace std;   vector<int> vc[200007];   int main() {     int n;     scanf( %d , &n);     int res = 0;     for (auto i = (1); i <= (n); ++i) {       int m;       scanf( %d , &m);       vc[i].resize(m);       for (auto j = (0); j <= (m - 1); ++j) scanf( %d , &vc[i][j]);       sort(vc[i].rbegin(), vc[i].rend());       res = max(res, vc[i][0]);     }     long long ans = 0LL;     for (auto i = (1); i <= (n); ++i)       ans += (long long)(res - vc[i][0]) * (int)vc[i].size();     printf( %lld n , ans);     return 0;   }   