【HDOJ6684】Rikka with Game（博弈）

题意：有一个由小写字母组成的字符串，A和B两个人轮流操作，A想让序列的字典序最大，B想最小

两人都能任意选择一位上的字母将其右移一位（a->b，b->c……z->a）或者直接结束游戏

A先手操作，问最后的序列

n<=1e2

思路：

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int,int> PII;
typedef pair<ll,ll> Pll;
typedef vector<int> VI;
typedef vector<PII> VII;
#define N  310000
#define M  4100000
#define fi first
#define se second
#define MP make_pair
#define pi acos(-1)
#define mem(a,b) memset(a,b,sizeof(a))
#define rep(i,a,b) for(int i=(int)a;i<=(int)b;i++)
#define per(i,a,b) for(int i=(int)a;i>=(int)b;i--)
#define lowbit(x) x&(-x)
#define Rand (rand()*(1<<16)+rand())
#define id(x) ((x)<=B?(x):m-n/(x)+1)
#define ls p<<1
#define rs p<<1|1

const ll MOD=1e9+7,inv2=(MOD+1)/2;
      double eps=1e-6;
      int INF=1e9;
      int da[4]={-1,1,0,0};
      int db[4]={0,0,-1,1};

      char ch[N];

int read()
{
   int v=0,f=1;
   char c=getchar();
   while(c<48||57<c) {if(c=='-') f=-1; c=getchar();}
   while(48<=c&&c<=57) v=(v<<3)+v+v+c-48,c=getchar();
   return v*f;
}


int main()
{
    //freopen("1.in","r",stdin);
    //freopen("1.out","w",stdout);

    int cas;
    scanf("%d",&cas);

    while(cas--)
    {
        scanf("%s",ch+1);
        int n=strlen(ch+1);
        rep(i,1,n)
        {
            if(ch[i]=='y') continue;
            if(ch[i]=='z') ch[i]='b';
            break;
        }
        rep(i,1,n) printf("%c",ch[i]);
        printf("
");
    }

    return 0;
}