Compilare: main.cpp: In function 'std::vector<int> dijkstra(const std::vector<std::vector<std::pair<int, int> > >&, int)': main.cpp:23:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[current].size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:39:39: 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); ^ main.cpp:40:41: 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); ^ main.cpp:43:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:48:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &src, &dst, &weight); ^