Compilare: main.cpp: In function 'void dijk(int)': main.cpp:36:27: 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:46:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("retea.in", "r", stdin); ^ main.cpp:47:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("retea.out", "w", stdout); ^ main.cpp:50:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &k); ^ main.cpp:52:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%lf", &x, &y, &cost); ^