100%AC

A8019,A8021和A8020几乎一模一样!

#include<cstdio>
int main(){
    int n,x,numbers[100];
    scanf("%d\n",&n);
    for(int i;i<n;i++){
        scanf("%d ",&numbers[i]);
    }
    scanf("\n%d",&x);
    for(int i;i<n;i++){
        if(numbers[i]==x){
            printf("%d",i+1);
            return 0;
        }
    }
    printf("-1");
}