2017南宁 I. Rake It In dfs博弈

题目链接：https://nanti.jisuanke.com/t/A1538

题解：因为k只有3，所以最多取6次，每次有9种选取可能，所以直接dfs选取即可

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int b[6][6];
int k;
int dfs(int u) {
	if(u > 2 * k) return 0;
	int ans = 1e9, cnt;
	int tmp;
	if(u & 1) {
		ans = 0;
		for(int i = 1; i <= 3; i++) {
			for(int j = 1; j <= 3; j++) {
				cnt = b[i][j] + b[i + 1][j] + b[i][j + 1] + b[i + 1][j + 1];
				
				
				tmp = b[i][j];
				b[i][j] = b[i][j + 1];
				b[i][j + 1] = b[i + 1][j + 1];
				b[i + 1][j + 1] = b[i + 1][j];
				b[i + 1][j] = tmp;
				
				ans = max(ans, cnt + dfs(u + 1));
				
				tmp = b[i][j];
				b[i][j] = b[i + 1][j];
				b[i + 1][j] = b[i + 1][j + 1];
				b[i + 1][j + 1] = b[i][j + 1];
				b[i][j + 1] = tmp;
			}
		}
	} else {
		for(int i = 1; i <= 3; i++) {
			for(int j = 1; j <= 3; j++) {
				cnt = b[i][j] + b[i + 1][j] + b[i][j + 1] + b[i + 1][j + 1];
				tmp = b[i][j];
				b[i][j] = b[i][j + 1];
				b[i][j + 1] = b[i + 1][j + 1];
				b[i + 1][j + 1] = b[i + 1][j];
				b[i + 1][j] = tmp;
				ans = min(ans, cnt + dfs(u + 1));
				tmp = b[i][j];
				b[i][j] = b[i + 1][j];
				b[i + 1][j] = b[i + 1][j + 1];
				b[i + 1][j + 1] = b[i][j + 1];
				b[i][j + 1] = tmp;
			}
		}
	}
	return ans;
}
int main() {
	int T;
	scanf("%d", &T);
	while(T--) {
		scanf("%d", &k);
		for(int i = 1; i <= 4; i++)
			for(int j = 1; j <= 4; j++)
				scanf("%d", &b[i][j]);
		printf("%d\n", dfs(1));
	}	
	return 0;
}