题目传送门：http://poj.org/problem?id=2975
最开始一直在想，怎么优化DP
然而后来发现，这TM只求有效的第一步有几种走法QAQ
#include<iostream>
#include<cstdio>
using namespace std;
const int MAXN = 1000+9;
int arr[MAXN],n,sta,vout;
int main(){
while (cin>>n && n) {
sta = vout = 0;
for (int i=1;i<=n;i++) cin>>arr[i], sta ^= arr[i];
if (sta) for (int i=1;i<=n;i++) {
sta ^= arr[i];
if (sta < arr[i]) vout++;
sta ^= arr[i];
}
printf("%d\n",vout);
}
return 0;
}
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