hdu 4628 Pieces 컬렉션 DP

 for(int subset = set ; subset >0 ;(--subset)&=set)

#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <cstring>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
 
#include <cstdlib>
#include <ctime>
#include <assert.h>
#include <queue>
#define REP(i,n) for(int i=0;i<n;i++)
#define TR(i,x) for(typeof(x.begin()) i=x.begin();i!=x.end();i++)
#define ALLL(x) x.begin(),x.end()
#define SORT(x) sort(ALLL(x))
#define CLEAR(x) memset(x,0,sizeof(x))
#define FILLL(x,c) memset(x,c,sizeof(x))
using namespace std;
 
const double EPS = 1e-8;

#define LL long long 
#define pb push_back
char in[20];
char tmp[20];
bool t[1<<16];
bool judge(int a){
    int idx = 0;
    int tot = 0;
    int b =a;
    while(a){
        idx++;
        if(a&1){
            tot ++;
            tmp[tot] = in[idx];
        }
        a>>=1;
    }
    for(int i=1;i<=tot/2;i++){
        if(tmp[i] != tmp [tot-i+1]){
            return false;
        }
    }
    return true;
}
int dp[1<<16];
const int inf = 10000;
int dfs(int i){
    if(dp[i]!= inf)return dp[i];
    int set = i;
    for(int subset = set ; subset >0 ;(--subset)&=set){
       
        if(t[subset]){
              dp[i] = min(dp[i],dfs(set^subset)+1); 
        }
    }
    
    return dp[i];
}
void solve(){
    int len = strlen(in+1);
    CLEAR(t);
    for(int i=1;i<(1<<len);i++){
        if(judge(i)){
            t[i] =1;
        }
    }
    for(int i=0;i<(1<<16);i++){
        dp[i] = inf;
    }
    dp[0]=0;
    cout << dfs((1<<len)-1)<<endl;;
}
int main(){
    int t = 0;
    cin >>t ;
    while(scanf("%s",in+1),t--){
         solve();
    }
   
    return 0;
}