Leet Palindrome Partitioning II
class Solution {
public:
int minCut(string s) {
int len = s.length();
int* p_dp = new int[len + ];
char* s_dp = new char[len * len];
int* mm = new int[len + ];
mm[] = ;
memset(s_dp, -, len * len);
memset(p_dp, , (len + ) * sizeof(int));
int ret;
for (int i=; i<=len; i++) {
int sub_len = i;
int minc = INT_MAX;
for (int j=; j<=i-; j++, sub_len--) {
char* p_is = &s_dp[j * len + i-];
char b = ;
if (sub_len >= && - != (b = s_dp[(j+) * len + i - ])) {
*p_is = b && (s[j] == s[j + sub_len - ]);
}
if (*p_is == -) {
int p = j, q = j + sub_len - ;
for (; p < q && s[p] == s[q]; p++, q--);
*p_is = (p < q) ? : ;
}
if (*p_is == ) continue;
if (p_dp[j] < minc) minc = p_dp[j];
if (minc == mm[j]) break;
}
p_dp [i] = minc + ;
mm[i] = p_dp[i];
for (int k = i-; k >= && mm[k]>mm[k+]; k--) {
mm[k] = mm[k+];
}
}
ret = p_dp[len];
delete[] mm;
delete[] p_dp;
delete[] s_dp;
return ret - ;
}
};
原来想着既然前一题中已经想到了类似dp的方法,这一题应该更简单才是,不过。。。不过。。。没有对判断回文着过过程进行优化,一直TLE,把它考虑掉后就可以过了,这里把求字符串是否为回文的过程和求最小分割的过程合并了,并且考虑在不可能有更小分割的情况下快速进入下一个循环过程,悲剧的一天。
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