【PAT甲级】1040. Longest Symmetric String (25)

#include <stdio.h>
#include <string.h>
#include <string>

int main(int argc, char* argv[]) {
char a[1001];
gets(a);
int n = strlen(a);

int h, e;
int lh, le;
int maxlen = 1;
int len = 0;
int i, j;
for (i = 0; i < n; i++) {
j = n - 1;
while (a[j] != a[i] && j > i) j--;
while (j > i) {
le = e = j;
lh = h = i;
while (h < e && a[h] == a[e]) {
h++;
e--;
}
if (h == e || h > e) {
len = le - lh + 1;
if (maxlen < len)
maxlen = len;
j--;
break;
} else {
j--;
while (a[j] != a[i] && j > i) j--;
}
}
}
printf("%d\n", maxlen);
return 0;
}