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#include <stdio.h>

#include <stdlib.h>

int b_s(int array[], int N){

int low = 0, high = N,mid;

while(low<high){

mid = low+(high-low)/2;

int expect = mid+1;

if(array[mid]>expect){

high=mid;

}else{

low=mid+1;

}

}

return low+1;

}

main(){

//int array[] = {1,2,3,4,5,6,7,8,9,10};

int array[] = {2,3,4,5,6,7};

int N = 7;

int res = b_s(array,N+1);

printf("res is %d\n",res);

return 0;

}