Leetcode 763. Partition Labels

文章作者：Tyan
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1. Description

Partition Labels

2. Solution

• Version 1

class Solution {
public:
    vector<int> partitionLabels(string S) {
        unordered_map<char, int> m;
        vector<int> result;
        vector<int> indices(S.length());
        for(int i = 0; i < S.length(); i++) {
            m[S[i]] = i;
        }
        for(int i = 0; i < S.length(); i++) {
            indices[i] = m[S[i]];
        }
        int max = 0;
        int start = 0;
        for(int i = 0; i < S.length(); i++) {
            if(indices[i] > max) {
                max = indices[i];
            }
            if(i == max) {
                result.push_back(max - start + 1);
                start = i + 1;
                max = 0;
            }
        }
        return result;
    }
};

• Version 2

class Solution {
public:
    vector<int> partitionLabels(string S) {
        unordered_map<char, int> m;
        vector<int> result;
        for(int i = 0; i < S.length(); i++) {
            m[S[i]] = i;
        }
        int max = 0;
        int start = 0;
        for(int i = 0; i < S.length(); i++) {
            if(m[S[i]] > max) {
                max = m[S[i]];
            }
            if(i == max) {
                result.push_back(max - start + 1);
                start = i + 1;
                max = 0;
            }
        }
        return result;
    }
};

Reference

1. https://leetcode.com/problems/partition-labels/description/