Compilare: user.cpp: In function ‘int main()’: user.cpp:37:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<edges[1].size(); i++){ ^ user.cpp:53:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<edges[target].size(); j++){ ^ user.cpp:15:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.in", "r", stdin); ^ user.cpp:16:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.out", "w", stdout); ^