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Palindrome Partitioning II in C++
Suppose we have a string s, we have to find the number of cuts needed to divide this string into different substring and each part is a palindrome. So if the string is like “ababba”, then this will take 2 cuts. [aba|bb|a]
To solve this, we will follow these steps −
n := number of characters in the string s
create one array called res of size n + 1
res[n] := -1
for i in range n – 1 down to 0
res[i] := n – i – 1
for j in range i to n
if substring of a, from index i, to j – i is a palindrome, then
res[i] := min of res[i] and 1 + res[j + 1]
return res[0]
Example
Let us see the following implementation to get a better understanding −
#include <bits/stdc++.h>
using namespace std;
bool isPalindrome(string A) {
int left = 0;
int right = A.size()-1;
while(left < right) {
if(A[left] != A[right]) {
return 0;
}
left++;
right--;
}
return 1;
}
int solve(string A) {
int n = A.size();
vector<int>result(n+1);
result[n] = -1;
for(int i=n-1;i>=0;i--) {
result[i] = n-i-1;
for(int j=i;j<n;j++) {
if(isPalindrome(A.substr(i, j-i+1))) {
result[i] = min(result[i], 1 + result[j+1]);
}
}
}
return result[0];
}
class Solution {
public:
int minCut(string s) {
return solve(s);
}
};
main(){
Solution ob;
cout << (ob.minCut("ababba"));
}Input
“ababba”
Output
2
Updated on: 26-May-2020
94 Views
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