C :

#include<stdio.h>
#define max(a,b)	(a>b?a:b)
int a[110][110];
int main()
{
	int n;
	scanf("%d",&n);
	for(int i=1;i<=n;i++)
	for(int j=1;j<=i;j++)
	scanf("%d",&a[i][j]);
	for(int i=n-1;i>=1;i--)
	for(int j=1;j<=i;j++)
	a[i][j]=max(a[i+1][j],a[i+1][j+1])+a[i][j];
	printf("%d",a[1][1]);
	return 0;
}

C++ :

#include <iostream>
using namespace std;

int main(){
    int n,i,j;
    int a[101][101] = {0};
    cin>>n;
    
    //从塔顶往塔底输入
	for(i = 0;i < n;i++){
		//读入第i行的内容
		for(j = 0;j <= i;j++){
			cin>>a[i][j];
		} 
	} 
	
	//从塔底的某个数，往塔顶走，倒推，a[i][j] 存放到达第i层的最大值 
	//它所能走得路线：正上方a[i+1][j],右上方a[i+1][j+1] 2条线
	for(i = n - 2;i >= 0;i--){
		for(j = 0;j <= i;j++){
			if(a[i + 1][j] > a[i + 1][j + 1]){
				a[i][j] = a[i][j] + a[i + 1][j];
			}else{
				a[i][j] = a[i][j] + a[i + 1][j + 1];
			}
		}
	}
	
	cout<<a[0][0]<<endl;
}

Java :

import java.util.Scanner;
public class Main {
    static int n;
    static int a[][] = new int[101][101];
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt(),i,j;
        for(i=1;i<=n;i++) {
            for(j=1;j<=i;j++) {
                a[i][j] = sc.nextInt();
            }
        }
        for(i=n-1;i>=1;i--) {
            for(j=1;j<=i;j++) {
                a[i][j] = a[i][j] + Math.max(a[i+1][j], a[i+1][j+1]);
            }
        }
        System.out.println(a[1][1]);
        sc.close();
    }
}

Python :

n=int(input())
a=[[0 for i in range(n)] for j in range(n)]
for i in range(n):
    sr=input().split()
    for j in range(i+1):
        a[i][j]=int(sr[j])
for i in range(n-2,-1,-1):
    for j in range(i+1):
        a[i][j]=a[i][j]+max(a[i+1][j],a[i+1][j+1])
print(a[0][0])