力扣：1854. 人口最多的年份

package com.算法专练.力扣.人口最多的年份;
 
import java.util.HashMap;
import java.util.Map;
 
/**
 * @author xnl
 * @Description:
 * @date: 2022/8/21   21:27
 */
public class Solution {
    public static void main(String[] args) {
        Solution solution = new Solution();
        // int[][] logs =  {{1993,1999},{2000,2010}};
        int[][] logs =  {{1950,1961},{1960,1971},{1970,1981}};
        System.out.println(solution.maximumPopulation(logs));
    }
 
    int offerSett = 1950;
    public int maximumPopulation(int[][] logs) {
        int[] delta = new int[101];
        for (int[] log : logs) {
            delta[log[0] - offerSett]++;
            delta[log[1] - offerSett]--;
        }
        int mx = 0, res = 0,  curr = 0;
        for (int i = 0 ;i < 101; i++){
            curr += delta[i];
            if (curr > mx){
                mx = curr;
                res = i;
            }
        }
        return res + offerSett;
    }
}

差分数组