Compilare: user.cpp: In function ‘std::pair<double, std::vector<std::pair<int, int> > > findClosestPair(int, int)’: user.cpp:32:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < strip.size(); k++) ^ user.cpp:33:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int q = 1; k + q < strip.size() && q < 8; q++) ^ user.cpp: In function ‘int main()’: user.cpp:39:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.in", "r", stdin); ^ user.cpp:40:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.out", "w", stdout); ^ user.cpp:41:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:42:74: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (int i = 1; i <= n; i++) scanf("%d %d", &p[i].first, &p[i].second); ^