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#include <iostream> using namespace std; int n; int mat[105][105]; int dp[105][105]; int rek(int i, int j) { if (i==(n-1)) { return mat[i][j]; } if(dp[i][j]!=-1) { return dp[i][j]; } int zbir=-2e9; if(i+1<n) { zbir=max(zbir,rek(i+1,j)+mat[i][j]); } if(j+1<n && i+1<n) { zbir=max(zbir,rek(i+1,j+1)+mat[i][j]); } dp[i][j]=zbir; return zbir; } int main() { cin>>n; for(int i=0;i<n;i++) { for(int j=0;j<(i+1);j++) { cin>>mat[i][j]; } } for(int i=0;i<n;i++) { for(int j=0;j<(i+1);j++) { dp[i][j]=-1; } } cout << rek(0, 0) << endl; return 0; }
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