Palindrome

#include <bits/stdc++.h>

#define i64 long long
#define u64 unsigned long long
#define i32 int
#define u32 unsigned int

#define pii pair<int, int>
#define pll pair<long long, long long>

#define ld long double
#define defmod 1000000007

#define mati64(a,b) vector<vector<i64>>(a, vector<i64>(b, 0));
using namespace std;
string s;

bool d1[2020][2020];
i64 d[2020][2020];

i64 hae(int i, int j){
	if(i >= j)
		return 0;

	if(d1[i][j])
		return d[i][j];
	d1[i][j] = 1;
	if(s[i] == s[j])
		d[i][j] = hae(i+1, j-1);
	else
		d[i][j] = hae(i+1, j)+1;
	d[i][j] = min(d[i][j], hae(i+1, j)+1);
	d[i][j] = min(d[i][j], hae(i, j-1)+1);
	d[i][j] = min(d[i][j], hae(i+1, j-1)+1);
	return d[i][j];
}
int main(){
	cin.sync_with_stdio(0);
	cin.tie(0);
	cin >> s;
	cout << hae(0, s.length()-1) << endl;
	return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED

Test 28

Verdict: ACCEPTED

Test 29

Verdict: ACCEPTED

Test 30

Verdict: ACCEPTED