palindrome-partitioning-ii.cc

// Palindrome Partitioning II
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define REP(i, n) FOR(i, 0, n)

class Solution {
public:
  int minCut(string s) {
    int n = s.size();
    vector<int> f(n+1);
    iota(f.begin(), f.end(), -1);
    REP(i, n) {
      for (int j = 0; i-j >= 0 && i+j < n && s[i-j] == s[i+j]; j++)
        f[i+j+1] = min(f[i+j+1], f[i-j]+1);
      for (int j = 1; i-j+1 >= 0 && i+j < n && s[i-j+1] == s[i+j]; j++)
        f[i+j+1] = min(f[i+j+1], f[i-j+1]+1);
    }
    return f[n];
  }
};