Compilare: main.cpp: In function 'void magic()': main.cpp:38:16: 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:102:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;p<Q.size();p<<=1); ~^~~~~~~~~ main.cpp:104:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (st+p<Q.size() && Q[st+p] <= x) st += p; ~~~~^~~~~~~~~ main.cpp:109:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;p<Q.size();p<<=1); ~^~~~~~~~~ main.cpp:111:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (st+p<Q.size() && Q[st+p] <= x) st += p; ~~~~^~~~~~~~~ main.cpp:73:30: 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:74:32: 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); ^