leetcode189周赛

计数

class Solution {
public:
    int busyStudent(vector<int>& startTime, vector<int>& endTime, int queryTime) {
        int n=startTime.size();
        int ans=0;
        for(int i=0;i<n;i++){
            if(queryTime>=startTime[i]&&queryTime<=endTime[i]){
                ans++;
            }
        }
        return ans;
    }
};
           

排序

class Solution {
public:
    string arrangeWords(string text) {
        stringstream ss(text);
        vector<string> set;
        string tmp;
        while(getline(ss,tmp,' ')){
            transform(tmp.begin(),tmp.end(),tmp.begin(),::tolower);
            set.push_back(tmp);
        }

        stable_sort(set.begin(),set.end(),[](const string& s1,const string& s2){return s1.size()<s2.size();});
        string ans=set[0];
        ans[0]=ans[0]-'a'+'A';
        for(int i=1;i<set.size();i++){
            ans+=" "+set[i];
        }
        return ans;
    }
};