func_code_string: #include <bits/stdc++.h>   using namespace std;   const double eps = (1e-8);   int dcmp(double a, double b) {     if (fabs(a - b) <= eps) return 0;     return a < b ? -1 : 1;   }   int main() {     ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);     int n, m;     double w;     cin >> n >> w >> m;     double how = n * w / (m * 1.0);     vector<vector<pair<int, double> > > res(m);     vector<double> bottles;     vector<int> cnt(n, 0);     for (int i = 0; i < n; i++) bottles.push_back(w);     cout << fixed << setprecision(6);     for (int i = 0; i < m; i++) {       double temp = how;       for (int j = 0; j < n; j++) {         if (dcmp(bottles[j], 0) == 0) continue;         if (dcmp(temp, 0) == 0) break;         if (bottles[j] > temp) {           res[i].push_back({j, temp});           bottles[j] -= temp;           temp = 0;           cnt[j]++;           break;         } else {           res[i].push_back({j, bottles[j]});           temp -= bottles[j];           bottles[j] = 0;           cnt[j]++;         }       }       if (dcmp(temp, 0) != 0) return cout <<  NO  << endl, 0;     }     for (int i = 0; i < n; i++) {       if (cnt[i] > 2 || dcmp(bottles[i], 0) != 0) return cout <<  NO  << endl, 0;     }     cout <<  YES  << endl;     for (int i = 0; i < m; i++) {       for (auto p : res[i]) {         cout << p.first + 1 <<     << p.second <<    ;       }       cout << endl;     }     return 0;   }   