Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:21:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[nod].size(); ++i) { ^ user.cpp: In function ‘void heavy(int, int, int)’: user.cpp:105:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[nod].size(); ++i) { ^ user.cpp:112:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[nod].size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:155:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < paths[i].v.size(); ++j) ^ user.cpp:124:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("delay.in", "r", stdin); ^ user.cpp:125:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("delay.out", "w", stdout); ^