Submission #294567

#	Time	Username	Problem	Language	Result	Execution time	Memory
294567		linear00000	Guess the number (BOI20_guess)	C++14	100 / 100	1 ms	384 KiB

Guess

#include<stdio.h>
main() {int N,s,e,m,a;scanf("%d",&N);s=1,e=N;
while(s<=e){
m=(s+e)/2;
printf("? %d\n",m);
fflush(stdout);
scanf("%d",&a);
if(a<0)s=m+1;
else if(a>0)e=m-1;
else break;
}
printf("= %d\n", m);
return 0;
}

Compilation message (stderr)

Guess.cpp:2:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    2 | main() {int N,s,e,m,a;scanf("%d",&N);s=1,e=N;
      |      ^
Guess.cpp: In function 'int main()':
Guess.cpp:2:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    2 | main() {int N,s,e,m,a;scanf("%d",&N);s=1,e=N;
      |                       ~~~~~^~~~~~~~~
Guess.cpp:7:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    7 | scanf("%d",&a);
      | ~~~~~^~~~~~~~~

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