Leetcode 55. Jump Game

文章作者：Tyan
博客：noahsnail.com  |  CSDN  |  简书

1. Description

Jump Game

2. Solution

• 递归遍历所有的可能

class Solution {
public:
    bool canJump(vector<int>& nums) {
        return jump(nums, 0);
    }
    
    bool jump(vector<int>& nums, int start) {
        if(start + nums[start] >= nums.size() - 1) {
            return true;
        }
        for(int i = 1; i <= nums[start]; i++) {
            if(nums[start + i] != 0) {
                if(jump(nums, start + i)) {
                    return true;
                }
                else {
                    nums[start + i] = 0;   
                }
            }
        }
        nums[start] = 0;
        return false;
    }
};

• 贪心算法

class Solution {
public:
    bool canJump(vector<int>& nums) {
        int current = nums.size() - 1;
        for(int i = current - 1; i >= 0; i--) {
            if(nums[i] + i >= current) {
                current = i;
            }
        }
        if(current == 0) {
            return true;
        }
        else {
            return false;
        }
    }
};

Reference

1. https://leetcode.com/problems/jump-game/description/