Compilare: main.cpp: In function 'void magic()': main.cpp:37:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<Q.size();i++){ ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:79:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;p<Q.size();p<<=1); ~^~~~~~~~~ main.cpp:81:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (st+p<Q.size() && Q[st+p] <= x) st += p; ~~~~^~~~~~~~~ main.cpp:86:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;p<Q.size();p<<=1); ~^~~~~~~~~ main.cpp:88:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (st+p<Q.size() && Q[st+p] <= x) st += p; ~~~~^~~~~~~~~ main.cpp:51:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("asi.in","r",stdin); ^ main.cpp:52:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("asi.out","w",stdout); ^ main.cpp:66:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&q); ^ main.cpp:68:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&sav[i].first,&sav[i].second); ^