题解 | #定位查找#

#include <bits/stdc++.h> #define N 20 using namespace std;

int main(){ int A[N] = {0};

int n;
// ~scanf("%d",&n) == scanf("%d",&n) != EOF
while(~scanf("%d",&n)){
	
    for(int i = 0; i < n; i++){
		//cin >> A[i];
		//getchar();  //去掉前方scanf读取之后留下的'\n' 
		scanf("%d",&A[i]);
	}
    int m,i;
    //bool flag = false;
    scanf("%d",&m);
    for(i = 0; i < n; i++){if(A[i]==m){break;}}
    if(i < n){printf("%d\n",i);}else{printf("No\n");}
}
return 0;

}