Compilare: main.cpp: In function 'int main()': main.cpp:35:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<arcs[x].size(); ++j) { ~^~~~~~~~~~~~~~~ main.cpp:50:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i<finalOrder.size(); ++i) ~^~~~~~~~~~~~~~~~~~ main.cpp:8:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.in", "r", stdin); ^ main.cpp:9:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.out", "w", stdout); ^ main.cpp:13:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:20:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^