func_code_string: #include <bits/stdc++.h>   using namespace std;   int main(int argc, const char* argv[]) {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int c, m, t, r, i, W[301], tot, j;     map<int, bool> used;     map<int, bool> ends;     map<int, bool> G;     cin >> m >> t >> r;     for (i = 0; i < m; i++) {       cin >> W[i];       G[W[i]] = true;     }     if (r > t) {       cout <<  -1 n ;       return 0;     }     c = 0;     tot = 0;     for (i = 0; i <= W[m - 1]; i++) {       if (G[i] == true) {         if (c < r) {           for (j = i - 1; j >= i - t && c < r; j--) {             if (used[j] == false) {               used[j] = true;               ends[j + t] = true;               c++;               tot++;             }           }         }         if (c < r) {           cout <<  -1 n ;           return 0;         }       }       if (ends[i] == true) c--;     }     cout << tot <<   n ;     return 0;   }   