Compilare: main.cpp: In function 'int main()': main.cpp:37:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < g[i].size(); j++) ~~^~~~~~~~~~~~~ main.cpp:46:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < g[nod].size(); j++) ~~^~~~~~~~~~~~~~~ main.cpp:54:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < gigi.size(); j++) ~~^~~~~~~~~~~~~ main.cpp:60:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < g[i].size(); j++) ~~^~~~~~~~~~~~~ main.cpp:69:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < g[nod].size(); j++) ~~^~~~~~~~~~~~~~~ main.cpp:23:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fof.in", "r", stdin); ^ main.cpp:24:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fof.out", "w", stdout); ^ main.cpp:26:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:30:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^