http://acm.pku.edu.cn/JudgeOnline/problem?id=1226注意幾點：?。保畬ψ址畯椭剖褂胹trcpy和strncpy 2.strstr 查找子串；?。?strrev對字符串反序 4.strncpy后要在末尾加上'\0' 5.二維數組放在全局位置
#include"stdio.h"
#include"string.h"
int n;
char str[100][100];
int searchMaxSubString(char * source)
{
int subStrLen=strlen(source),sourceStrLen=strlen(source);
int i,j;
bool foundMaxSubStr;
char subStr[101],revSubStr[101];
while(subStrLen>0)
{
for(i=0;i<=sourceStrLen-subStrLen;i++)
{
strncpy(subStr,source+i,subStrLen);
strncpy(revSubStr,source+i,subStrLen);
subStr[subStrLen]=revSubStr[subStrLen]='\0';
strrev(revSubStr);
foundMaxSubStr=true;
for(j=0;j<n;j++)
if(strstr(str[j],subStr)==NULL&&strstr(str[j],revSubStr)==NULL){foundMaxSubStr=false;break;}
if(foundMaxSubStr) return subStrLen;
}
subStrLen--;
}
return 0;
}
void main()
{
int i,nCase,minStrLen,subStrLen;
char minStr[101];
scanf("%d",&nCase);
while(nCase--)
{
scanf("%d",&n);
minStrLen=101;
for(i=0;i<n;i++)
{
scanf("%s",str[i]);
if(strlen(str[i])<minStrLen){strcpy(minStr,str[i]);minStrLen=strlen(minStr);}
}
printf("%d\n",searchMaxSubString(minStr));
}
}