Compilare: main.cpp: In function 'void dijkstra(int)': main.cpp:18:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graph_orientat[start_node].size();i++) ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graph_orientat[current_node].size();i++) ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:23:13: warning: variable 'll' set but not used [-Wunused-but-set-variable] int ll; ^~ main.cpp: In function 'int main()': main.cpp:48:39: 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:49:41: 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:52:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:56:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &a, &b, &c); ^