#include<iostream>

#include<cstdio>

#include<cstring>

#include<algorithm>

#define x first

#define y second

using namespace std;

typedef pair<char,char> PCC;

const int N = 3010;

PCC pcc[N];

int main()

{

 int n, len;

 cin >> n >> len;

 if(n == 1){

   puts("1");

   return 0;

 }

 for(int i = 1; i <= n; i ++)

 {

   string s;

   cin >> s;

   char minc = s[0], maxc = s[0];

   for(int j = 1; j < len; j ++ )

   {

     if(s[j] < minc) minc = s[j

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dfs意义：从x过来的最小值 记忆化dfs定义f数组存储结果 //dfs函数 long long int dfs(int x,int lwalk,int rwalk) { if(f[x][lwalk][rwalk]!=0x7f7f7f7f7f7f7f7f) return f[x][lwalk][rwalk]; if(x==0) return f[x][lwalk][rwalk]=0; if(lwalk==0&&rwalk==0&&mp[b[x]]) return f[x][lwalk][rwalk]=min(min(min(min(dfs(x-1,0,0),dfs(x-1,1,0)),dfs(x-1,2,0)),dfs(x-1,0,1)),dfs(x-1,0,2)); else if(lwalk==0&&rwalk==1) return f[x][lwalk][rwalk]=min(min(dfs(x-1,1,0)+r[x],dfs(x-1,2,0)+r[x]),dfs(x-1,0,0)+r[x]); else

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                  #include<bits/stdc++.h>        using namespace std;                int main()        {            freopen("split.in","r",stdin);            freopen("split.out","w",stdout);                        int a,i=2;            cin>>a;           &n

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#include<bits/stdc++.h>

using namespace std;

int main()

{

freopen("title.in","r",stdin);

freopen("title.out","w",stdout);

char n[5];

int m,l;

gets(n);

m=strlen(n);

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一个 n log

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