Compilare: user.cpp: In function ‘int main()’: user.cpp:33:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (graph.size() < source + 1 || graph.size() < dest + 1) graph.push_back(vector<Edge*>()); ^ user.cpp:33:61: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (graph.size() < source + 1 || graph.size() < dest + 1) graph.push_back(vector<Edge*>()); ^ user.cpp:24:36: 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:25:38: 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); ^ user.cpp:28:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:32:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &source, &dest, &cost); ^