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  • CF-805A

    A. Fake NP
    time limit per test
    1 second
    memory limit per test
    256 megabytes
    input
    standard input
    output
    standard output

    Tavak and Seyyed are good friends. Seyyed is very funny and he told Tavak to solve the following problem instead of longest-path.

    You are given l and r. For all integers from l to r, inclusive, we wrote down all of their integer divisors except 1. Find the integer that we wrote down the maximum number of times.

    Solve the problem to show that it's not a NP problem.

    Input

    The first line contains two integers l and r (2 ≤ l ≤ r ≤ 109).

    Output

    Print single integer, the integer that appears maximum number of times in the divisors.

    If there are multiple answers, print any of them.

    Examples
    input
    19 29
    output
    2
    input
    3 6
    output
    3
    Note

    Definition of a divisor: https://www.mathsisfun.com/definitions/divisor-of-an-integer-.html

    The first example: from 19 to 29 these numbers are divisible by 2: {20, 22, 24, 26, 28}.

    The second example: from 3 to 6 these numbers are divisible by 3: {3, 6}.

    题意:

    求从 l 到 r 出现的最多的因数。

    每两个数就会有一个因数2,所以若非 l==r ,

    则2为出现次数最多的。

    附AC代码:

     1 #include<bits/stdc++.h>
     2 using namespace std;
     3 
     4 int main(){
     5     int l,r;
     6     cin>>l>>r;
     7     if(l==r)
     8     cout<<l<<endl;
     9     else
    10     cout<<2<<endl;
    11     return 0;
    12 } 
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  • 原文地址:https://www.cnblogs.com/Kiven5197/p/6815027.html
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