bzoj1055 [HAOI2008]玩具取名

Posted 2020-06-21 HugeGun

题目链接

区间DP……

dp[i][j][k]表示i~j段能不能变成k字符

输入写丑了，不要在意QAQ

 1 #include<algorithm>
 2 #include<iostream>
 3 #include<cstdlib>
 4 #include<cstring>
 5 #include<cstdio>
 6 #include<string>
 7 #include<cmath>
 8 #include<ctime>
 9 #include<queue>
10 #include<stack>
11 #include<map>
12 #include<set>
13 #define rre(i,r,l) for(int i=(r);i>=(l);i--)
14 #define re(i,l,r) for(int i=(l);i<=(r);i++)
15 #define Clear(a,b) memset(a,b,sizeof(a))
16 #define inout(x) printf("%d",(x))
17 #define douin(x) scanf("%lf",&x)
18 #define strin(x) scanf("%s",(x))
19 #define LLin(x) scanf("%lld",&x)
20 #define op operator
21 #define CSC main
22 typedef unsigned long long ULL;
23 typedef const int cint;
24 typedef long long LL;
25 using namespace std;
26 void inin(int &ret)
27 {
28     ret=0;int f=0;char ch=getchar();
29     while(ch<‘0‘||ch>‘9‘){if(ch==‘-‘)f=1;ch=getchar();}
30     while(ch>=‘0‘&&ch<=‘9‘)ret*=10,ret+=ch-‘0‘,ch=getchar();
31     ret=f?-ret:ret;
32 }
33 int a[26][26][26],W,I,N,G;
34 int aa[222][222][26];
35 const char qi[5]={‘\0‘,‘W‘,‘I‘,‘N‘,‘G‘};
36 char s[111],ch[5];
37 bool dfs(int l,int r,char c)
38 {
39     int &ret=aa[l][r][c-‘A‘];
40     if(ret!=-1)return ret;
41     if(l==r&&s[l]==c)return ret=1,1;
42     else if(l==r)return ret=0,0;
43     re(i,1,4)re(j,1,4)if(a[c-‘A‘][qi[i]-‘A‘][qi[j]-‘A‘])
44         re(k,l,r-1)if(dfs(l,k,qi[i])&&dfs(k+1,r,qi[j]))
45             return ret=1,1;
46     return ret=0,0;
47 }
48 int main()
49 {
50     Clear(aa,-1);Clear(a,0);
51     inin(W),inin(I),inin(N),inin(G);
52     re(i,1,W)
53     {
54         strin(ch);
55         a[‘W‘-‘A‘][ch[0]-‘A‘][ch[1]-‘A‘]=1;
56     }
57     re(i,1,I)
58     {
59         strin(ch);
60         a[‘I‘-‘A‘][ch[0]-‘A‘][ch[1]-‘A‘]=1;
61     }
62     re(i,1,N)
63     {
64         strin(ch);
65         a[‘N‘-‘A‘][ch[0]-‘A‘][ch[1]-‘A‘]=1;
66     }
67     re(i,1,G)
68     {
69         strin(ch);
70         a[‘G‘-‘A‘][ch[0]-‘A‘][ch[1]-‘A‘]=1;
71     }
72     strin(s+1);
73     int n=strlen(s+1);int bo=0;
74     if(dfs(1,n,‘W‘)){cout<<"W";bo=1;}
75     if(dfs(1,n,‘I‘)){cout<<"I";bo=1;}
76     if(dfs(1,n,‘N‘)){cout<<"N";bo=1;}
77     if(dfs(1,n,‘G‘)){cout<<"G";bo=1;}
78     if(!bo)cout<<"The name is wrong!";
79      return 0;
80 }