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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. const long long MOD = 1e9 + 7;
  4. long long r, c;
  5.  
  6. long long lt(long long A, long long B) {
  7.     if (B == 0) return 1;
  8.     if (B % 2) return (A * lt((A * A) % MOD, B / 2)) % MOD;
  9.     else return lt((A * A) % MOD, B / 2);
  10. }
  11.  
  12. main() {
  13.     ios_base::sync_with_stdio(false);
  14.     cin.tie(0); cout.tie(0);
  15.     cin >> r >> c;
  16.  
  17.     long long ans = 18;
  18.     long long cnt = r + c - 2;
  19.     ans *= lt(6, cnt);
  20.     ans %= MOD;
  21.     ans *= lt(2, r * c - cnt - 1);
  22.     ans %= MOD;
  23.  
  24.     cout << ans << '\n';
  25.  
  26.     return 0;
  27. }
  28.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/DRRNrs
language:
C++14 (gcc 8.3)
created:
14 hours ago
visibility:
public

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