Compilare: user.cpp: In function ‘void dijkstra()’: user.cpp:45:19: warning: unused variable ‘di’ [-Wunused-variable] long long di = h.begin()->first; ^ user.cpp: In function ‘void sol()’: user.cpp:68:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:76:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &a, &b, &c); ^ user.cpp: In function ‘int main()’: user.cpp:95:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algoritm.in", "r", stdin); ^ user.cpp:96:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algoritm.out", "w", stdout); ^