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能运行出结果,但是就是WA。。怎么办

Posted by gladystbc at 2010-05-16 00:52:06 on Problem 1159
#include"stdio.h"
#include"stdlib.h"
int main()
{
    int num,num_,i,a,b=0,n=0,t,m;
    char str[5000],c[2500];
    scanf("%d\n",&num);
    num_=num;
    for(i=0;i<num_;i++)
    {scanf("%c",&str[i]);}
    a=(int)(num_/2);
    for(m=0;m<a;m++)
    {c[m]=str[num_-m-1];}
    for(m=0;m<a;m++)
    {
                    
                    for(t=n+b;t<a-m;t++)
                    {
                            if(str[m]!=c[t])n++;
                            else b++;break;
                    }
    }
    printf("%d\n",2*n);
    system("pause");
    return 0;
}        
  

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