Compilare: main.cpp: In function 'void df(int)': main.cpp:48:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<graf[nod].size(); ++i) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:79:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("clepsidra.in", "r", stdin); ^ main.cpp:80:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("clepsidra.out", "w", stdout); ^ main.cpp:82:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:85:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^