Compilare: main.cpp: In function 'void belford(int, int)': main.cpp:83:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[u].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'bool dijkstra(int, int)': main.cpp:127:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[u.nod].size(); i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:185:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("fmcm.in", "r", stdin); ^ main.cpp:187:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.out", "w", stdout); ^ main.cpp:191:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &m, &s, &d); ^ main.cpp:195:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &x, &y, &c, &z); ^