题解 | #不一样的逆序数#
不一样的逆序数
http://www.nowcoder.com/questionTerminal/b7536a2ffb1947e4930d12ece2f838b4
打表题
#include<bits/stdc++.h>
using namespace std;
int a[]={2178,21978,219978,2199978,21782178,21999978};
int n;
int main(){
cin>>n;
int cnt=0;
for (int i=0;i<sizeof(a)/sizeof(a[0]);++i){
if (n/4>=a[i])cnt++;
else break;
}
cout<<cnt<<endl;
if (cnt==0)return 0;
for (int i=0;i<cnt;++i){
cout<<a[i]<<" "<<a[i]*4<<endl;
}
return 0;
}