Compilare: main.cpp: In function 'bool dijkstra()': main.cpp:74:7: warning: unused variable 'dst' [-Wunused-variable] int dst = -q.top().fi; ^~~ main.cpp: In function 'int main()': main.cpp:122:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.in", "r", stdin); ^ main.cpp:123:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.out", "w", stdout); ^