题解 | #参加会议的最大数目#

class Solution {
public:
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param meetings int整型vector<vector<>> 
     * @return int整型
     */
    // 暴力: 返回最大会议数
    int process(vector<vector<int> >& meetings, int done, int timeLine) {
        if(meetings.size()==0) {
            return done;
        }
        // 剩下会议
        int maxV = done;
        for(int i=0; i<meetings.size(); i++) {
            // 开始时间晚
            if(meetings[i][0]>=timeLine) {
                vector<vector<int> > next = copybutExcept(meetings, i);
                maxV = max(maxV, process(next, done+1, meetings[i][1]));
            }
        }
        return maxV;
    }

    vector<vector<int> > copybutExcept(vector<vector<int> > & meetings, int i) {
        vector<vector<int> > Next(meetings.size()-1);
        int index = 0;
        for(int k=0; k<meetings.size(); k++) {
            if(k!=i) {
                Next[index++] = meetings[k];
            }
        }
        return Next;
    }

    int attendmeetings(vector<vector<int> >& meetings) {
        // write code here
        if(meetings.size()==0) {
            return 0;
        }
        return process(meetings, 0, 0);
    }
};