Compilare: main.cpp: In instantiation of 'long long int closestPoints<T>::computeMinimumDistance() [with T = long long int]': main.cpp:82:54: required from here main.cpp:61:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<xv.size(); ++i) main.cpp: In function 'int main()': main.cpp:72:33: 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); ^ main.cpp:73:35: 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); ^ main.cpp:75:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:79:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^