#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main() {
    srand(time(NULL));

    int list[100];
    int i, j;
    
    for(i=0;i<100;i++){
        list[i]=rand()%100;
    }
    int n;
    for(j=0; j<99; j++){
        for(i=j+1; i<100;i++){
            if(list[j]>list[i]){
                n=list[j];
                list[j]=list[i];
                list[i]=n;
            }
        }
    }

     for(i=0;i<100;i++){
        printf("%d   %d\n", i, list[i]);
    }

    printf("\n----------------\n");
    n=50;
    scanf("%d", &j);
    int min=0, max=99;
    while(1){
        if((n==0) || (n>=98) || (list[n]==j) || (list[n]<j && list[n+1] >j)){
            printf("%d %d", n, list[n]);
            break;
        }else if(list[n]>j){
            max=n+1;
        }else{
            min=n-1;
        }
        n=(int)((min+max)/2);
    }
    
    return 0;
}

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