算法训练Day27 | ● 455.分发饼干 ● 376. 摆动序列 ● 53. 最大子序和

455.分发饼干

class Solution {
public:
    int findContentChildren(vector<int>& g, vector<int>& s) {
        sort(g.begin(), g.end());
        sort(s.begin(), s.end());

        int result = 0;
        int s_index = 0;
        for(int i= 0; i<g.size(); i++){
            for(int j = s_index; j<s.size(); j++){
                if(s[j]>=g[i]){
                    result++;
                    s_index=j+1;
                    break;
                }
            }
        }
        return result;

    }
};

参考文章：代码随想录-455.分发饼干

376. 摆动序列

class Solution {
public:
    int wiggleMaxLength(vector<int>& nums) {
        if (nums.size() <= 1) return nums.size();
        vector<int> list;
        int prediff = 0;
        int curdiff = 0;
        int result=1;
        for(int i=0; i<nums.size()-1; i++){
            curdiff = nums[i+1]-nums[i];
            if((curdiff>0 && prediff<=0) ||(curdiff<0 && prediff>=0)){
                result++;
                prediff = curdiff;
            }
            
            
        }
        return result;
    }
};

参考文章：代码随想录-376. 摆动序列

53. 最大子序和

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

    }
};

参考文章：代码随想录- 53. 最大子序和