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#include <iostream> #include <cstring> using namespace std; int n; int mat[101][101]; int dp[101][101]; const int INF = 1e8; int rec(int i, int j) { if(i == n - 1) { return mat[i][j]; } if(dp[i][j] != -1) { return dp[i][j]; } int res = -INF; if(i + 1 < n and mat[i + 1][j] != -1) { res = max(res, rec(i + 1, j) + mat[i][j]); } if(i + 1 < n and j + 1 < n and mat[i + 1][j + 1] != -1) { res = max(res, rec(i + 1, j + 1) + mat[i][j]); } dp[i][j] = res; return res; } int main() { cin >> n; memset(mat, -1, sizeof mat); memset(dp, -1, sizeof dp); for(int i = 0; i < n; i++) { for(int j = 0; j <= i; j++) { cin >> mat[i][j]; } } cout << rec(0, 0) << endl; return 0; }
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