Duplicate Pair (이 또는 조작)

2060 단어 알고리즘ACM
Link:http://acm.fzu.edu.cn/problem.php?pid=1001
Problem 1001 Duplicate Pair
Accept: 4923    Submit: 23300 Time Limit: 1000 mSec    Memory Limit : 65536 KB
 Problem Description
An array of length n, with address from 1 to n inclusive, contains entries from the set {1,2,...,n-1} and there's exactly two elements with the same value. Your task is to find out the value.
 Input
Input contains several cases.
Each case includes a number n (1The input is ended up with the end of file.
 Output
Your must output the value for each case, one per line.
 Sample Input
21 141 2 3 2
 Sample Output
12
 Source IBM Challenge 2004.1
AC code:
#include<iostream>
#include<algorithm>
#include<cmath>
#include<cstdio>
using namespace std;
int n,t,tt,x,ans;
int main(){
    while(scanf("%d",&n)==1){
       t=0;
       tt=0;
       while(n--){
        scanf("%d",&x);
        t^=x;
        tt^=n;
       }
        ans=t^tt;
        printf("%d
",ans); } return 0; }

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