代码随想录day52

想进个大厂2023-08-19 11:56

300最长递增子序列

cpp 复制代码

class Solution {
public:
    int lengthOfLIS(vector<int>& nums) 
    {
        int piles = 0;    // 牌堆数初始化为 0
        vector<int> top(nums.size());   // 牌堆数组 top
        for (int i = 0; i < nums.size(); i++) 
        {
            int poker = nums[i];  
            int left = 0, right = piles;   
            while (left < right) 
            {
                int mid = (left + right) / 2; 
                if (top[mid] < poker) 
                {
                    left = mid + 1;
                } else {
                    right = mid;
                }
            }
            if (left == piles) piles++;
            top[left] = poker;
        }
        // 牌堆数就是 LIS 长度
        return piles;
    }
};

674最长连续递增子序列

cpp 复制代码

class Solution {
public:
    int findLengthOfLCIS(vector<int>& nums) 
    {
        int result=0;
        if(nums.size()<=1) return nums.size();
        vector<int>dp(nums.size(),1);
        for(int i=1;i<nums.size();i++)
        {
            if(nums[i]>nums[i-1]) dp[i]=max(dp[i],dp[i-1]+1);
            result=dp[i]>result?dp[i]:result;
        }
        return result;
    }
};

718最长重复子数组

cpp 复制代码

class Solution {
public:
    int findLength(vector<int>& nums1, vector<int>& nums2) 
    {
        vector<vector<int>> dp (nums1.size() + 1, vector<int>(nums2.size() + 1, 0));
        int result = 0;
        for(int i=1;i<=nums1.size();i++)
        {
            for(int j=1;j<=nums2.size();j++)
            {
                if(nums1[i-1]==nums2[j-1])
                {
                    dp[i][j]=dp[i-1][j-1]+1;
                    if (dp[i][j] > result) result = dp[i][j];
                }
                
            }
        }
        return result;
    }
};