poj 1085 Triangle War (状压+记忆化搜索)
Triangle War
Description
Triangle War is a two-player game played on the following triangular grid:
Two players, A and B, take turns filling in any dotted line connecting two dots, with A starting first. Once a line is filled, it cannot be filled again. If the line filled by a player completes one or more triangles, she owns the completed triangles and she is awarded another turn (i.e. the opponent skips a turn). The game ends after all dotted lines are filled in, and the player with the most triangles wins the game. The difference in the number of triangles owned by the two players is not important. For example, if A fills in the line between 2 and 5 in the partial game on the left below: Input
You will be given a number of games in the input. The first line of input is a positive integer indicating the number of games to follow. Each game starts with an integer 6 <= m <= 18 indicating the number of moves that have been made in the game. The next
m lines indicate the moves made by the two players in order, each of the form i j (with i < j) indicating that the line between i and j is filled in that move. You may assume that all given moves are legal. Output
For each game, print the game number and the result on one line as shown below. If A wins, print the sentence "A wins." If B wins, print "B wins."
Sample Input 4 Sample Output Game 1: B wins. Source |
题意:
两个人玩游戏,依次在三角形上放边,假设能构成三角形。则奖励继续该此人放,问最后得到的三角形多。
思路:
给边编号,记忆化搜索即可。做过好多这样的题。就不多写思路了。
代码:
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <string>
#include <map>
#include <stack>
#include <vector>
#include <set>
#include <queue>
#pragma comment (linker,"/STACK:102400000,102400000")
#define maxn 1005
#define MAXN 50005
#define mod 1000000009
#define INF 0x3f3f3f3f
#define pi acos(-1.0)
#define eps 1e-6
typedef long long ll;
using namespace std;
int n,m,ans,cnt,tot,flag;
bool vis[10];
int dp[300000],mp[15][15],sc[5];
int tri[9][3]=
{
0,1,2,3,4,7,2,4,5,5,6,8,9,10,15,
7,10,11,11,12,16,8,12,13,13,14,17
};
int cal(int s)
{
int i,j,t=0;
for(j=0; j<9; j++)
{
if((s&(1<<tri[j][0]))&&(s&(1<<tri[j][1]))&&(s&(1<<tri[j][2]))) t++;
}
return t;
}
int dfs(int state,int score)
{
if(dp[state]!=-1) return dp[state];
int i,j,t,tst,num,best=0,tmp;
num=9-score;
for(i=0; i<=17; i++)
{
if(state&(1<<i)) continue ;
tst=state|(1<<i);
t=cal(tst);
if(t>num)
{
tmp=t-num+dfs(tst,score-(t-num));
best=max(best,tmp);
}
else
{
tmp=score-dfs(tst,score);
best=max(best,tmp);
}
}
dp[state]=best;
return best;
}
int main()
{
int i,j,t,test=0;
mp[1][2]=0;mp[1][3]=1;mp[2][3]=2;mp[2][4]=3;mp[2][5]=4;mp[3][5]=5;
mp[3][6]=6;mp[4][5]=7;mp[5][6]=8;mp[4][7]=9;mp[4][8]=10;mp[5][8]=11;
mp[5][9]=12;mp[6][9]=13;mp[6][10]=14;mp[7][8]=15;mp[8][9]=16;mp[9][10]=17;
scanf("%d",&t);
while(t--)
{
scanf("%d",&n);
tot=0;
int x,y,z,turn=0,num=0;
sc[0]=sc[1]=0;
memset(vis,0,sizeof(vis));
for(i=1; i<=n; i++)
{
scanf("%d%d",&x,&y);
z=mp[x][y];
tot|=(1<<z);
flag=0;
for(j=0; j<9; j++)
{
if(vis[j]) continue ;
if((tot&(1<<tri[j][0]))&&(tot&(1<<tri[j][1]))&&(tot&(1<<tri[j][2])))
{
vis[j]=1;
num++;
flag=1;
sc[turn]++;
}
}
if(!flag) turn^=1;
}
memset(dp,-1,sizeof(dp));
z=dfs(tot,9-num);
sc[turn]+=z;
sc[turn^1]+=(9-num-z);
if(sc[0]>sc[1]) printf("Game %d: A wins.\n",++test);
else printf("Game %d: B wins.\n",++test);
}
return 0;
}
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