#include<iostream> (5488)#include<bits/stdc++.h> using namespace std; vector<int>v1; vector<int>v2; int main() { int n; cin>>n; if(n<=100||n>=2000){ cout<<0; return 0; } int ans=0; for(int a=1;a<=9;a++){ for(int b=0;b<=9;b++){ for(int c=0;c<=9;c++){ if(a==b||a==c||b==c){ continue; } int abc=a*100+b*10+c; int acc=a*100+c*10+c; if(abc+acc==n){ //cout<<"abc:"<<abc<<",acc:"<<acc<<endl; ans++; v1.push_back(abc); v2.push_back(acc); } } } } cout<<ans; if(ans>0){ cout<<"\n"; for(int i=0;i<ans;i++){ cout<<v1[i]<<" "<<v2[i]<<endl; } } }