Submission #642319

#	Time	Username	Problem	Language	Result	Execution time	Memory
642319		cigneve	Guess the number (BOI20_guess)	C++14	0 / 100	0 ms	208 KiB

Guess

#pragma GCC optimize ("O3")
#include <stdio.h>
int main(){
  int N,input=5;
  scanf("%d",&N);
  int l=1,r=N;
  while (input!=0){
    printf("? %d\n",(r-l)/2+l);
    scanf("%d",&input);
    if (input==1){
      l=(r-l)/2+l;
    }
    else if (input==-1){
      r=(r-l)/2+l;
    }
  }
  printf("= %d",(r-l)/2+l);
}

Compilation message (stderr)

Guess.cpp: In function 'int main()':
Guess.cpp:5:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 |   scanf("%d",&N);
      |   ~~~~~^~~~~~~~~
Guess.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%d",&input);
      |     ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 29
• Subtask 2: 0 / 71