Number (0): Everything in this space must add up to 0. The answer is 4-0, placed horizontally; 0-0, placed horizontally; 0-2, placed vertically.
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int bucketIdx = (arr[i] * bucketCount) / (max + 1); // 均匀映射。爱思助手下载最新版本对此有专业解读
const i = this.arr.length - 1;