bzoj1413: [ZJOI2009]取石子游戏

ORZ

做法跟网上是一样的，自己照着手推一次好了。

#include<cstdio>
#include<iostream>
#include<cstring>
#include<cstdlib>
#include<algorithm>
#include<cmath>
using namespace std;

int a[1100],L[1100][1100],R[1100][1100];
int main()
{
    freopen("a.in","r",stdin);
    freopen("a.out","w",stdout);
    int T;
    scanf("%d",&T);
    while(T--)
    {
        int n;
        scanf("%d",&n);
        for(int i=1;i<=n;i++)
            scanf("%d",&a[i]),L[i][i]=R[i][i]=1;
            
        for(int C=1;C<=n;C++)
            for(int l=1;l<=n;l++)
            {
                int r=l+C-1;if(r>n)break;
                
                if(R[l][r-1]==a[r])L[l][r]=0;
                else if(L[l][r-1]> a[r]&&R[l][r-1]>a[r])L[l][r]=a[r];
                else if(L[l][r-1]> a[r]&&R[l][r-1]<a[r])L[l][r]=a[r]-1;
                else if(L[l][r-1]<=a[r]&&R[l][r-1]>a[r])L[l][r]=a[r]+1;
                else if(L[l][r-1]< a[r]&&R[l][r-1]<a[r])L[l][r]=a[r];
                
                if(L[l+1][r]==a[l])R[l][r]=0;
                else if(R[l+1][r]> a[l]&&R[l+1][r]>a[l])R[l][r]=a[l];
                else if(R[l+1][r]> a[l]&&R[l+1][r]<a[l])R[l][r]=a[l]-1;
                else if(R[l+1][r]<=a[l]&&R[l+1][r]>a[l])R[l][r]=a[l]+1;
                else if(R[l+1][r]< a[l]&&R[l+1][r]<a[l])R[l][r]=a[l];
            }
        printf("%d
",(L[2][n]==a[1])?0:1);
    }
    return 0;
}