CF1005A Tanya and Stairways

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    • 237提交
  • 题目来源 CodeForces 1005A
  • 评测方式 RemoteJudge
  • 标签 概率论,统计 模拟
  • 难度 入门难度
  • 时空限制 1000ms / 256MB

题解

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    题意翻译

    题目描述:

    给你N个数(1≤N≤1000),这N个数是由M个从1开始的连续自然序列组成的

    输入输出格式:

    输入格式:

    第一行,一个数:N

    第二行N个数,分别是组成M个序列的元素

    输出格式:

    第一行,一个数:M

    第二行,M个数,分别是这M个序列的长度

    题目描述

    Little girl Tanya climbs the stairs inside a multi-storey building. Every time Tanya climbs a stairway, she starts counting steps from $ 1 $ to the number of steps in this stairway. She speaks every number aloud. For example, if she climbs two stairways, the first of which contains $ 3 $ steps, and the second contains $ 4 $ steps, she will pronounce the numbers $ 1, 2, 3, 1, 2, 3, 4 $ .

    You are given all the numbers pronounced by Tanya. How many stairways did she climb? Also, output the number of steps in each stairway.

    The given sequence will be a valid sequence that Tanya could have pronounced when climbing one or more stairways.

    输入输出格式

    输入格式:

    The first line contains $ n $ ( $ 1 \le n \le 1000 $ ) — the total number of numbers pronounced by Tanya.

    The second line contains integers $ a_1, a_2, \dots, a_n $ ( $ 1 \le a_i \le 1000 $ ) — all the numbers Tanya pronounced while climbing the stairs, in order from the first to the last pronounced number. Passing a stairway with $ x $ steps, she will pronounce the numbers $ 1, 2, \dots, x $ in that order.

    The given sequence will be a valid sequence that Tanya could have pronounced when climbing one or more stairways.

    输出格式:

    In the first line, output $ t $ — the number of stairways that Tanya climbed. In the second line, output $ t $ numbers — the number of steps in each stairway she climbed. Write the numbers in the correct order of passage of the stairways.

    输入输出样例

    输入样例#1: 复制
    7
    1 2 3 1 2 3 4
    
    输出样例#1: 复制
    2
    3 4 
    输入样例#2: 复制
    4
    1 1 1 1
    
    输出样例#2: 复制
    4
    1 1 1 1 
    输入样例#3: 复制
    5
    1 2 3 4 5
    
    输出样例#3: 复制
    1
    5 
    输入样例#4: 复制
    5
    1 2 1 2 1
    
    输出样例#4: 复制
    3
    2 2 1 
    提示
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