题解 | #找x#

#include <cstdio>
#include <iostream>
using namespace std;

int main() {
    int n;
    int x;
    
    while (scanf("%d",&n) != EOF) {
        int flag = 0;
        int a[n];
        for (int i = 0; i < n; ++i) {
            scanf("%d",&a[i]);
        }
        scanf("%d",&x);
        
        for (int j = 0; j < n; ++j) {
            if (x == a[j]) {
                flag = 1;
                printf("%d",j);
                break;
            }
        }
        if(flag == 0){
            printf("-1");
        }
    }
}