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日!交到3276上去了…………不爽,写一下题解

Posted by lmy199433 at 2011-10-21 20:20:50 on Problem 3267 and last updated at 2011-10-21 20:28:07
f[i]表示把前i位变成合法序列删去的最少字符
f[i]=min(f[j]+min(trans(s[j+1..i],a[k]))
就是把j+1..i变成一个单词所删的字符数+把前j位变成合法序列删去的最少字符
在匹配的时候可以记录一个just【】数组,记录每一个单词匹配到了哪里.
#include<iostream>
#include<string>
#include<stdio.h>
using namespace std;
const int N=600+10,M=300+10;
int n,m,just[N],f[N];
string st,a[N];
inline int min(int a,int b)
{if(a<b)return a;return b;}
int main()
{
  freopen("poj3267.in","r",stdin);
  freopen("poj3267.out","w",stdout);
  scanf("%d%d\n",&n,&m);
  cin>>st;
  st="0"+st;
  for(int i=1;i<=n;i++)
    cin>>a[i];
  for(int i=1;i<=m;i++)
  {
    for(int j=1;j<=n;j++)
      just[j]=a[j].size()-1;
    f[i]=i;
    for(int j=i;j>0;j--)
      for(int k=1;k<=n;k++)
      {
        if(st[j]==a[k][just[k]])
          just[k]--;
        if(just[k]<0)
          f[i]=min(f[i],f[j-1]+i-j+1-a[k].size());
      }
  }
  printf("%d\n",f[m]);
}

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