Compilare: user.cpp: In function ‘void fixGraph()’: user.cpp:49:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < bad.size() / 2; i++) { ^ user.cpp: In function ‘int main()’: user.cpp:98:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < cyc.size(); i++) { ^ user.cpp:100:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < cyc.size() - 1 && cyc[i].second > m) pth.push_back(vector <int>()); ^ user.cpp:104:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < pth.size(); i++) { ^ user.cpp:81:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("johnie.in", "r", stdin); ^ user.cpp:82:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("johnie.out", "w", stdout); ^ user.cpp:84:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:87:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &u, &v); ^