1365-how-many-numbers-are-smaller-than-the-current-number.js

/**
 * @param {number[]} nums
 * @return {number[]}
 */
const smallerNumbersThanCurrent = function(nums) {
    const count = new Array(101).fill(0);
    const res = new Array(nums.length).fill(0);
    for (let i = 0; i < nums.length; i++) count[nums[i]]++
    for (let i = 1 ; i <= 100; i++) count[i] += count[i-1]
    for (let i = 0; i < nums.length; i++) {
        if (nums[i] == 0) res[i] = 0
        else res[i] = count[nums[i] - 1]
    }
    return res;
};