제출 #642320

#제출 시각아이디문제언어결과실행 시간메모리
642320ErennedirloGuess the number (BOI20_guess)C++17
0 / 100
1 ms208 KiB
#include<iostream> using namespace std; int main(){ int N; cin>>N; N+=1; int left=1, right=N; while(1){ int tmp=(right-left)/2+left; int ans; cout<<"?"<<" "<<tmp; cout.flush(); cin>>ans; if(ans==-1){ right=tmp; } else if(ans==0){ cout<<"= "<<tmp; break; } else{ left=tmp; } } return 0; }
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