Rikka with string BC#37

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Rikka with string

Accepts: 395

QwQ

//#include<bits/stdc++.h>
#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<string>
#include<queue>
#include<vector>
#include<map>
#include<cstdlib>
#include<set>
#include<stack>
#include<cstring>
using namespace std;
template<class T>inline T read(T&x)
{
    char c;
    while((c=getchar())<=32)if(c==EOF)return 0;
    bool ok=false;
    if(c=='-')ok=true,c=getchar();
    for(x=0; c>32; c=getchar())
        x=x*10+c-'0';
    if(ok)x=-x;
    return 1;
}
template<class T> inline T read_(T&x,T&y)
{
    return read(x)&&read(y);
}
template<class T> inline T read__(T&x,T&y,T&z)
{
    return read(x)&&read(y)&&read(z);
}
template<class T> inline void write(T x)
{
    if(x<0)putchar('-'),x=-x;
    if(x<10)putchar(x+'0');
    else write(x/10),putchar(x%10+'0');
}
template<class T>inline void writeln(T x)
{
    write(x);
    putchar('\n');
}
//-------ZCC IO template------
const int maxn=100001;
const double inf=999999999;
#define lson (rt<<1),L,M
#define rson (rt<<1|1),M+1,R
#define M ((L+R)>>1)
#define For(i,t,n) for(int i=(t);i<(n);i++)
typedef long long  LL;
typedef double DB;
typedef pair<int,int> P;
#define bug printf("---\n");
#define mod 10007
int n;
char a[maxn];
bool pan(char *s)
{
    for(int i=0; i<=n/2; i++)
    {
        if(a[i]!=a[n-1-i])return true;
    }
    return false;
}

int b[maxn];

int main()
{
//    #ifndef ONLINE_JUDGE
//    freopen("in.txt","r",stdin);
//    #endif // ONLINE_JUDGE
    int m,i,j,k,t;
    while(read(n))
    {
        scanf("%s",a);
        memset(b,0,sizeof(b));
        bool flag=false;
        for(i=0,j=0; i<n; i++)if(a[i]=='?')
            {
                flag=true;
                b[j++]=i;
            }
        if((!flag&&!pan(a))||(!pan(a)&&n%2==1&&a[n/2]=='?'&&j==1))
        {
            puts("QwQ");
        }
        else
        {
            bool ok=false;
            for(i=0;i<n;i++)if(a[i]=='?')a[i]='a';
            for(i=j-1; i>=0; i--)
            {
                for(char k='a'; k<='z'; k++)
                {
                    a[b[i]]=k;
                    if(pan(a))
                    {
                        ok=true;
                        break;
                    }
                }
                if(ok)
                    break;
                else
                    a[b[i]]='a';
            }
            puts(a);
        }
    }
    return 0;
}

Rikka with string BC#37

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原文地址：http://blog.csdn.net/u013167299/article/details/44999259