poj 1812 Zuma Game

#include <iostream>#include <cstdio>#include <cstring>using namespace std;int n,m;char table[50],hand[10];bool use[10];int minres;void DFS(int totuse,char *nowtable,int use){    if (strlen(nowtable) == 0)    {        if (totuse < minres)    minres = totuse;        return;    }    if (totuse >= minres)   return;    char newtable[50];    int nowlen = strlen(nowtable);    for (int i = 0;i < m;i++)    if (((use>>i)&1) == 0)    {        for (int j = 1;j < nowlen;j++)        if (nowtable[j-1] == hand[i] && nowtable[j] == hand[i])        { int len = 0; for (int k = 0;k < j;k++) {     newtable[len] = nowtable[k];     len++; } newtable[len] = hand[i]; len++; for (int k = j;k < nowlen;k++) {     newtable[len] = nowtable[k];     len++; } newtable[len] = 0; while (true) {     bool cando = false;     for (int k = 0;k <= len-3;k++)         if (newtable[k] != '*')  for (int q = 1;k+q-1 <= len;q++)      if (newtable[k+q-1] != newtable[k])      {          if (q > 3)          {   for (int p = 1;p < q;p++)       newtable[k+p-1] = '*';   cando = true;          }          break;      }     if (cando == false) break;     int tlen = len;     len = 0;     for (int k = 0;k < tlen;k++)         if (newtable[k] != '*')         {  newtable[len] = newtable[k];  len++;         }     newtable[len] = 0; } DFS(totuse+1,newtable,use|(1<<i));        }        int nexti = m;        for (int j = 0;j < m;j++)        if (((use>>j)&1) == 0 && hand[j] == hand[i] && i != j) nexti = j;        if (nexti < m)        { for (int j = 0;j < nowlen;j++) if (nowtable[j] == hand[i]) {     int len = 0;     for (int k = 0;k < j;k++)     {         newtable[len] = nowtable[k];         len++;     }     newtable[len] = hand[i];     len++;     newtable[len] = hand[nexti];     len++;     for (int k = j;k < nowlen;k++)     {         newtable[len] = nowtable[k];         len++;     }     newtable[len] = 0;     while (true)     {         bool cando = false;         for (int k = 0;k <= len-3;k++)  if (newtable[k] != '*')      for (int q = 1;k+q-1 <= len;q++)          if (newtable[k+q-1] != newtable[k])          {   if (q > 3)   {       for (int p = 1;p < q;p++)newtable[k+p-1] = '*';       cando = true;   }   break;          }         if (cando == false) break;         int tlen = len;         len = 0;         for (int k = 0;k < tlen;k++)  if (newtable[k] != '*')  {      newtable[len] = newtable[k];      len++;  }         newtable[len] = 0;     }     DFS(totuse+2,newtable,use|(1<<i)|(1<<nexti)); }        }    }}int main(){    int t;    scanf("%d",&t);    for (int ft = 1;ft <= t;ft++)    {        scanf("%d%d",&n,&m);        scanf("%s",table);        int len = strlen(table);     while (true)     {         bool cando = false;         for (int k = 0;k <= len-3;k++)  if (table[k] != '*')      for (int q = 1;k+q-1 <= len;q++)          if (table[k+q-1] != table[k])          {   if (q > 3)   {for (int p = 1;p < q;p++)table[k+p-1] = '*';       cando = true;   }   break;          }         if (cando == false) break;         int tlen = len;         len = 0;         for (int k = 0;k < tlen;k++)  if (table[k] != '*')  {      table[len] = table[k];      len++;  }         table[len] = 0;     }        scanf("%s",hand);        memset(use,false,sizeof(use));        minres = m+1;        DFS(0,table,0);        if (minres == m+1) printf("losen");        else printf("%dn",minres);    }}