BZOJ1413 [ZJOI2009]取石子游戏

[ZJOI2009]取石子游戏
思路：
博弈+dp，详见yyb博客
代码：

#pragma GCC optimize(2)
#pragma GCC optimize(3)
#pragma GCC optimize(4)
#include<bits/stdc++.h>
using namespace std;
#define y1 y11
#define fi first
#define se second
#define pi acos(-1.0)
#define LL long long
#define ll long long
//#define mp make_pair
#define pb push_back
#define ls rt<<1, l, m
#define rs rt<<1|1, m+1, r
#define ULL unsigned LL
#define pll pair<LL, LL>
#define pli pair<LL, int>
#define pii pair<int, int>
#define piii pair<pii, int>
#define pdd pair<double, double>
#define mem(a, b) memset(a, b, sizeof(a))
#define debug(x) cerr << #x << " = " << x << "\n";
#define fio ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
//head

const int N = 1e3 + 10;
int L[N][N], R[N][N], T, n, a[N];
int main() {
	scanf("%d", &T);
	while(T--) {
		scanf("%d", &n);
		for (int i = 1; i <= n; ++i) scanf("%d", &a[i]);
		for (int i = n; i >= 1; --i) {
			L[i][i] = R[i][i] = a[i];
			for (int j = i+1; j <= n; ++j) {
				int l = L[i][j-1], r = R[i][j-1], x = a[j];
				if(x == r) L[i][j] = 0;
				else if(x < r && x < l) L[i][j] = x;
				else if(l <= x && x < r) L[i][j] = x+1;
				else if(r < x && x < l) L[i][j] = x-1;
				else L[i][j] = x;
				
				l = L[i+1][j], r = R[i+1][j], x = a[i];
				if(x == l) R[i][j] = 0;
				else if(x < r && x < l) R[i][j] = x;
				else if(l < x && x < r) R[i][j] = x-1;
				else if(r <= x && x < l) R[i][j] = x+1;
				else R[i][j] = x;
			}
		}
		if(n == 1) printf("1\n");
		else if(a[1] == L[2][n]) printf("0\n");
		else printf("1\n");
	}
	return 0; 
}