problem D

#include<stdio.h>
#include<stdlib.h>

int main(void){
  
    char a[1000];
    int count=0, max[2];
    int i, j, k, m, p;
    int l;
      
    scanf("%s", a);
  
    l=strlen(a);
    max[1]=0;
  
    for(i=0,j=1; i<l-1&&j<l; i++,j++){
        if(a[i]==a[j]){
              count=1;                              
              for(k=i-1,m=j+1;k>=0&&m<l;k--,m++){
                  if(a[k]!=a[m]) break;
                  else count=count+1;                                                     
                  }
              if(count>max[1]){
                  max[0]=i;
                  max[1]=count;
                  }
                                              
              }
        }
  
    for(p=max[0]-max[1]+1;p<max[1];p++)    printf("%c", a[p]);   
                                
    system("PAUSE");                                       
    return 0;

}

需debug之處：

若有出現更大的迴文，無法覆蓋max[1]值，無法print