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  1. #include <bits/stdc++.h> 
  2. using namespace std;  
  3.  
  4. typedef long long ll;  
  5. typedef pair<int, int> ii;  
  6.  
  7. const int INF = 1e9; 
  8. const ll LINF = 1e18; 
  9.  
  10. const int N = 1e2 + 5;   
  11.  
  12. int n, m; 
  13. int a[N][N];
  14. int dp[N][N];  
  15.  
  16. int main() {
  17. 	ios::sync_with_stdio(0); cin.tie(0);  	
  18. 	cin >> n >> m;     
  19.  
  20. 	for (int i = 1; i <= n; i++) {
  21. 		for (int j = 1; j <= m; j++) cin >> a[i][j];  
  22. 	}
  23.  
  24. 	// update lên 
  25. 	for (int i = 1; i <= n; i++) {
  26. 		for (int j = 1; j <= m; j++) dp[i][j] = -INF;  
  27. 	}
  28.  
  29. 	for (int i = 1; i <= n; i++) dp[i][1] = a[i][1];  
  30.  
  31. 	for (int j = 1; j < m; j++) {
  32. 		for (int i = 1; i <= n; i++) {
  33. 			dp[i - 1][j + 1] = max(dp[i - 1][j + 1], dp[i][j] + a[i - 1][j + 1]); 
  34. 			dp[i][j + 1] = max(dp[i][j + 1], dp[i][j] + a[i][j + 1]); 
  35. 			dp[i + 1][j + 1] = max(dp[i + 1][j + 1], dp[i][j] + a[i + 1][j + 1]); 
  36. 		}
  37. 	}
  38.  
  39. 	int ans = -INF;  
  40. 	for (int i = 1; i <= n; i++) ans = max(ans, dp[i][m]);  
  41.  
  42. 	cout << ans << '\n'; 
  43. }
Success #stdin #stdout 0.01s 5276KB
comments (?)
stdin
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5 7
9 -2 6 2 1 3 4
0 -1 6 7 1 3 3
8 -2 8 2 5 3 2
1 -1 6 2 1 6 1
7 -2 6 2 1 3 7
stdout
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41
https://ideone.com/VJy6g8
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
secret

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