Plus

In the first line, output the number of pairs $(p,q)$ you found.

Then each line contains two integers, indicating $p$ and $q$ .

If there are multiple pairs $(p,q)$ , you should output them in the increasing order. $(p_1,q_1)<(p_2,q_2)$ if and only if $p_1<p_2$ or ( $p_1=p_2$ and $q_1<q_2$ ).

C++(g++ 7.5.0) 解法, 执行用时: 3ms, 内存消耗: 464K, 提交时间: 2023-05-24 18:53:57

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin>>n;
    cout<<(n>2?"1\n2 3":"0")<<endl;
}

C++ 解法, 执行用时: 3ms, 内存消耗: 448K, 提交时间: 2022-06-08 15:41:24

#include<stdio.h>
long long t;int main(){scanf("%ld",&t);if(t>2)printf("1\n2 3");else printf("0");}

pypy3 解法, 执行用时: 148ms, 内存消耗: 26832K, 提交时间: 2022-07-11 12:42:44

n = int( input() )

if n < 3:
    print("0")
else :
    print("1\n2 3")

Python3 解法, 执行用时: 42ms, 内存消耗: 4548K, 提交时间: 2022-06-17 18:42:06

n=int(input())
if(n>2):
    print("1\n2 3")
else:print("0")

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