Compilare: user.cpp: In member function ‘void aib::aib1_update(int, int)’: user.cpp:27:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<aib1.size();i+=i&(-i)) aib1[i]=min(aib1[i],s); ^ user.cpp: In member function ‘void aib::aib2_update(int, int)’: user.cpp:32:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<aib2.size();i+=i&(-i)) aib2[i]=min(aib2[i],s); ^ user.cpp: In function ‘int main()’: user.cpp:118:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mindist.in", "r", stdin); ^ user.cpp:119:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mindist.out", "w", stdout); ^ user.cpp:120:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:123:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].x,&v[i].y); ^