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C - Lucky Numbers (easy)
Problem description Petya loves lucky numbers. Everybody knows that positive integers are lucky if their decimal representation doesn't contain digits ...
分类:其他好文   时间:2018-06-01 20:41:17    阅读次数:237
[数论]Factors of Factorial
题目描述 You are given an integer N. Find the number of the positive divisors of N!, modulo 109+7.Constraints1≤N≤103 输入 The input is given from Standard I ...
分类:其他好文   时间:2018-05-31 23:02:18    阅读次数:181
Digit Sum II( ABC044&ARC060)
问题 G: Digit Sum II 题目描述 For integers b(b≥2) and n(n≥1), let the function f(b,n) be defined as follows:·f(b,n)=n, when n<b·f(b,n)=f(b,floor(n?b))+(n mo ...
分类:其他好文   时间:2018-05-29 22:57:20    阅读次数:175
E - Perfect Number
Problem description We consider a positive integer perfect, if and only if the sum of its digits is exactly 10. Given a positive integer k, your task ...
分类:其他好文   时间:2018-05-29 15:01:09    阅读次数:125
leetcode 263. Ugly Number
Write a program to check whether a given number is an ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. Example ...
分类:其他好文   时间:2018-05-28 00:53:30    阅读次数:139
Sum of Consecutive Prime Numbers(素数打表+尺取)
Description Some positive integers can be represented by a sum of one or more consecutive prime numbers. How many such representations does a given po ...
分类:其他好文   时间:2018-05-26 12:57:12    阅读次数:152
目标检测 — 评价指标
评价指标: 准确率 (Accuracy),混淆矩阵 (Confusion Matrix),精确率(Precision),召回率(Recall),平均正确率(AP),mean Average Precision(mAP),交除并(IoU),ROC + AUC,非极大值抑制(NMS)。 1、准确率 (A ...
分类:其他好文   时间:2018-05-22 14:44:53    阅读次数:3021
Why people hate Trump?
I have seen many videos that hate Trump on youtube and sayings against Trump on Quora, while I see many positive comments about Trump on Zhihu, which ...
分类:其他好文   时间:2018-05-20 15:23:00    阅读次数:172
First Missing Positive
41. First Missing Positive Given an unsorted integer array, find the smallest missing positive integer. Example 1: Example 2: Example 3: Note: Your al ...
分类:其他好文   时间:2018-05-20 15:19:29    阅读次数:180
LeetCode - Spiral Matrix II
Given a positive integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. Example: Input: 3 Output: [ [ 1, 2, 3 ], [ 8, ...
分类:其他好文   时间:2018-05-20 10:49:51    阅读次数:148
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