Compilare: user.cpp: In function ‘void solve()’: user.cpp:170:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (c != comps.size() - 1) { ^ user.cpp:173:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < comp.size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:189:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("network.in", "r", stdin); ^ user.cpp:190:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("network.out", "w", stdout); ^ user.cpp:192:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:195:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %lf %lf", &x, &y, &p1, &p2); ^