#include<stdio.h>void equal(int a[],int N){    int i;    for(i=0;i<N;i++)    {        if(i<a[i])        {            printf("no exist\n");            printf("%d\n",i);            break;        }        if(i==a[i])            printf("equal %d\n",i);    }}int main(){    int arr[10]={-5,-1,1,5,7,8,9,10,11,12};    equal(arr,10);}