Compilare: user.cpp: In function ‘int main()’: user.cpp:44:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[1].size(); i++) { ~~^~~~~~~~~~~~~ user.cpp:56:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < v[vecin].size(); k++) { ~~^~~~~~~~~~~~~~~~~ user.cpp:69:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < v[vecin].size(); k++) { ~~^~~~~~~~~~~~~~~~~ user.cpp:28:39: 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:29:41: 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); ^ user.cpp:31:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &Noduri, &Muchii); ^ user.cpp:35:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &orig, &dest, &cost); ^