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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define fast_io ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)
  4. #define int long long
  5. #define endl '\n'
  6.  
  7. void solve(){
  8.     int n,m;
  9.     cin>>n>>m;
  10.     cout<<n+m-1<<endl;
  11.     int i=1,j=1;
  12.     while(true){
  13.     	cout<<i<<" "<<j<<endl;
  14.     	j++;
  15.     	if (j==m) break;
  16.     	cout<<i<<" "<<j<<endl;
  17.     	i++;
  18.     	if(i==n) break;
  19.  
  20.     }
  21.     cout<<n<<" "<<m<<endl;
  22.  
  23. }
  24.  
  25.  
  26. int32_t main(){
  27.     fast_io;
  28.     int t=1;
  29.  
  30.     while(t--) solve();
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/j899b3
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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