POJ3096：Surprising Strings（map）

http://poj.org/problem?id=3096

for循环真是奇妙!

#include <string.h>
#include <stdio.h>
#include <string>
#include <map>
using namespace std;

int main()
{
    char a[100],st[3];
    int l,flag;
    while(scanf("%s",a)!=EOF)
    {
        if(a[0]=='*') break;
        l=strlen(a);
        if(l<=2)
        {
            printf("%s is surprising.
",a);
            continue;
        }
        flag=0;
        for(int i=0;i<=l-2;i++)
        {
            map<string,int>q;//相当于定义了局部变量，每次执行for循环相当与重新赋值或者q.clear();
            for(int j=0;j<=l-2-i;j++)
            {
                st[0]=a[j];
                st[1]=a[j+1+i];//i代表间隔
                st[2]='';
                q[st]++;
                if(q[st]>=2)
                {
                    flag=1;
                    break;
                }
            }
            if(flag==1)
            {
                printf("%s is NOT surprising.
",a);
                break;
            }

        }
        if(flag==0) printf("%s is surprising.
",a);
    }
    return 0;
}