题解 | 找x

#include <iostream>
#include<algorithm>
#include<vector>
#include<map>
#include<string>
using namespace std;
int main(){
	int n;
	while (cin >> n) {
		vector<int >v1;
		int a;
		for (int i = 0; i < n; i++) {
			cin >> a;
			
			v1.push_back(a);
		}
		int x;
		cin >> x;
		for (int i = 0; i < n; i++) {
			if (v1[i] == x){
				cout << i; return 0;}

	    }cout << "-1"; return 0;
		
	}
}