M厂笔试题-数组分组

题目描述

将给定的一个数组分组，要求数组内的最大值与最小值之差小于等于M。输出所分的最小的组数

贪心+双指针

// you can use includes, for example:
#include <algorithm>
#include <cmath>

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(vector<int> &D, int X) {
    // write your code in C++14 (g++ 6.2.0)
    int res = 0;
    int n = D.size();
    for (int i = 0; i < n; i++) {
        
        int j = i+1;
        int st = D[i], ed = D[i];
        while (j < n && abs(D[j] - st) <= X && abs(D[j] - ed) <= X) {
            st = min(st, D[j]);
            ed = max(ed, D[j]);
            j++;
        }

        if (D[j] - st > X || ed - D[j] > X ) res++;

        i = j - 1;
    }

    return res;
}