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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios::sync_with_stdio(false);
  6.     cin.tie(nullptr);
  7.  
  8.     int M, N;
  9.     cin >> M >> N;
  10.  
  11.     vector<vector<int>> a(M + 2, vector<int>(N + 2));
  12.     for (int i = 1; i <= M; i++)
  13.         for (int j = 1; j <= N; j++)
  14.             cin >> a[i][j];
  15.  
  16.     const long long NEG = -4e18;
  17.     vector<vector<long long>> dp(M + 2, vector<long long>(N + 2, NEG));
  18.  
  19.  
  20.     for (int i = 1; i <= M; i++)
  21.         dp[i][1] = a[i][1];
  22.  
  23.  
  24.     for (int j = 2; j <= N; j++) {
  25.         for (int i = 1; i <= M; i++) {
  26.             dp[i][j] = a[i][j] + max({ dp[i][j-1],
  27.                                        dp[i-1][j-1],
  28.                                        dp[i+1][j-1] });
  29.         }
  30.     }
  31.  
  32.  
  33.     long long ans = NEG;
  34.     for (int i = 1; i <= M; i++)
  35.         ans = max(ans, dp[i][N]);
  36.  
  37.     cout << ans;
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0.01s 5316KB
comments (?)
stdin 
4 4
1 1 1 -3
-3 -3 -1 3
-3 2 -3 2
-1 2 -3 -3
stdout 
6
https://ideone.com/MjtRxh
language:
C++14 (gcc 8.3)
created:
4 hours ago
visibility:
public

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