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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define Fast                          \
  5.     ios_base::sync_with_stdio(false); \
  6.     cin.tie(NULL);
  7. void input()
  8. {
  9.     if (fopen("stdin.txt", "r"))
  10.     {
  11.         freopen("stdin.txt", "r", stdin);
  12.         freopen("stdout.txt", "w", stdout);
  13.     }
  14. }
  15. const ll mod = 1e9 + 7;
  16. const int N = 100 + 5;
  17. const int M = 100000 + 5;
  18. ll dp[M][4];
  19. int main()
  20. {
  21.     Fast;
  22.     input();
  23.     memset(dp, -1, sizeof dp);
  24.     int n;
  25.     cin >> n;
  26.     int mx = -1e9;
  27.     vector<vector<int>> v(n, vector<int>(3));
  28.     for (int i = 0; i < n; i++)
  29.     {
  30.         for (int j = 0; j < 3; j++)
  31.             cin >> v[i][j];
  32.     }
  33.     function<ll(int, int)> rec = [&](int i, int j) -> ll
  34.     {
  35.         if (i == n)
  36.             return 0;
  37.         if (~dp[i][j])
  38.             return dp[i][j];
  39.         ll sum = -1e9;
  40.         for (int x = 0; x < 3; x++)
  41.         {
  42.             if (x == j)
  43.                 continue;
  44.             sum = max(sum, v[i][x] + rec(i + 1, x));
  45.         }
  46.         return dp[i][j] = sum;
  47.     };
  48.     cout << rec(0, 0);
  49.     return 0;
  50. }
Success #stdin #stdout 0.01s 7672KB
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https://ideone.com/M0PpHr
language:
C++14 (gcc 8.3)
created:
22 hours ago
visibility:
public

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