leetcode (Arranging Coins)
Title:Arranging Coins 441
Difficulty:Easy
原題leetcode地址: https://leetcode.com/problems/arranging-coins/
1. 數學公式,i注意溢位問題
時間複雜度:O(1)。
空間複雜度:O(1)。
/** * 數學公式: x(x+1)/2<=n --> x<=(sqrt(8*n+1)-1)/2,注意溢位問題 * @param n * @return */ public static int arrangeCoins(int n) { return (int) ((Math.sqrt(8 * (long) n + 1) - 1) / 2); }
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