题解 | #找x#

#include<iostream>
#include<cstdio>
#include<algorithm>

using namespace std;

const int MAX = 200;

int arr[MAX];

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