B – IQ test

Problem description

Bob is preparing to pass IQ test. The most frequent task in this test is to find out which one of the givenn numbers differs from the others. Bob observed that one number usually differs from the others in evenness. Help Bob — to check his answers, he needs a program that among the givenn numbers finds one that is different in evenness.

Input

The first line contains integern (3 ≤ n ≤ 100) — amount of numbers in the task. The second line containsn space-separated natural numbers, not exceeding 100. It is guaranteed, that exactly one of these numbers differs from the others in evenness.

Output

Output index of number that differs from the others in evenness. Numbers are numbered from 1 in the input order.

Examples

Input

52 4 7 8 10

Output

3

Input

41 2 1 1

Output

2解题思路：结合样例，可以发现只要奇数或偶数出现的次数为1，就输出那个数的下标，水过！AC代码：

1 #include<bits/stdc++.h>
 2 using namespace std;
 3 int main(){
 4     int n,x,odd=0,od=1,even=0,ed=1;
 5     cin>>n;
 6     for(int i=1;i<=n;++i){
 7         cin>>x;
 8         if(x%2){od=i;odd++;}
 9         else{ed=i;even++;}
10     }
11     if(odd<even)cout<<od<<endl;
12     else cout<<ed<<endl;
13     return 0;
14 }

原文链接: https://www.cnblogs.com/acgoto/p/9170585.html

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