pat 1040 Longest Symmetric String
2013-03-06 21:51
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题意要求最长回文串,遍历一遍,找到回文串最中间的那个字母(BAB中的A或ABBA中的第一个B),再以该字母为中心,往左右拓展,若能相等,则相加。就算样例可以过,也要测试一下其它简单的情况,如AAA, BB。
要注意的数据点有:
aaa 3
aassaa 6
AC代码:
要注意的数据点有:
aaa 3
aassaa 6
AC代码:
//1040 21:20 #include<stdio.h> #include<string.h> char str[1005]; int main() { //scanf("%s",str); //freopen("C:\\Documents and Settings\\Administrator\\桌面\\input.txt","r",stdin); gets(str); int len=strlen(str); int i,index=0,j; int cnt=1,res=1; for(i=1;i<len;i++){ if(str[i-1]==str[i+1]){ cnt=1; index=i; for(j=1;j<=index&&index+j<len;j++){ if(str[index-j]==str[index+j]) cnt+=2; else break; } } if(cnt>res) res=cnt; if(str[i]==str[i-1]){ cnt=2; index=i-1; for(j=1;j<=index&&index+1+j<len;j++){ if(str[index-j]==str[index+1+j]) cnt+=2; else break; } } if(cnt>res) res=cnt; } printf("%d",res); return 0; }
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