Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

var infty = 100000 * 2
var scanner = bufio.NewScanner(os.Stdin)

func nextInt() (int, error) {
	scanner.Scan()
	return strconv.Atoi(scanner.Text())
}

func findMaximumSubarray(arr []int) int {
	currentMaxSum, maxSumContainsTail := -infty, -infty

	for j := range arr {
		if arr[j] > maxSumContainsTail+arr[j] {
			maxSumContainsTail = arr[j]
		} else {
			maxSumContainsTail += arr[j]
		}
		if currentMaxSum < maxSumContainsTail {
			currentMaxSum = maxSumContainsTail
		}

		// fmt.Println(arr[j], currentMaxSum, maxSumContainsTail)
	}
	return currentMaxSum
}

func main() {
	scanner.Split(bufio.ScanWords)
	for {
		size, _ := nextInt()
		if size == 0 {
			break
		}

		arr := make([]int, size)
		for i := range arr {
			n, _ := nextInt()
			arr[i] = n
		}

		maximumSum := findMaximumSubarray(arr)
		fmt.Println(maximumSum)
	}
}

C++: #include <algorithm>
#include <iostream>
#include <string>
#include <cassert>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <deque>
#include <iomanip>
#include <limits>
#include <map>
#include <queue>
#include <stack>
#include <vector>

#define FOR(i,k,n) for(int (i) = (k); (i) < (n); ++(i))
#define rep(i,n) FOR(i,0,n)
#define pb push_back
#define all(v) begin(v), end(v)
#define debug(x) cerr << #x << ": " << x << endl
#define debug2(x,y) cerr << #x << ": " << x << ", " << #y << ": " << y << endl

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<i_i, int> p_i;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
template<class T> using vv=vector<vector<T>>;
typedef deque<int> di;
typedef deque<deque<int>> ddi;

int n;

int calc(int s, int a[], int b[]){
    if(b[s] != 0) {
        return b[s];
    }

    if(s == n-1) {
        return b[n-1] = max(0, a[n-1]);
    }
    return b[s] = max(a[s]+calc(s+1,a,b), 0);
}

int main() {
    while(1) {
        int a[5000] = {};
        int b[5000] = {};
        cin >> n;
        if(n == 0) {
            break;
        }
        rep(i,n) {
            cin >> a[i];
        }
        int max = -300000;
        calc(0,a,b);
        FOR(i,0,n) {
            if(b[i] > max) {
                max = b[i];
            }
        }
        cout << max << endl;
    }
	return 0;
}

C++: #include <iostream>
#include <vector>
#include <numeric>
#include <algorithm>

int main()
{
	int data_count = 0;
	while ((std::cin >> data_count) && (data_count > 0)) {
		std::vector<long> dataset;
		for (int i = 0; i < data_count; ++i) {
			int data = 0;
			std::cin >> data;
			dataset.push_back(data);
		}

		long max_sum = dataset[0];
		for (int i = 0; i < data_count - 1; ++i) {
			for (int j = i + 1; j < data_count; ++j) {
				max_sum = std::max(
					max_sum,
					std::accumulate(dataset.begin() + i, dataset.begin() + j, 0L));
			}
		}
		std::cout << max_sum << std::endl;
	}

	return 0;
}

C++: #include <iostream>

using namespace std;

int main() {
  for (;;) {
    int n;
    cin >> n;
    if (!n) return 0;
    int s = 0, m = 0, r = 0;
    for (int i = 0; i < n; i++) {
      int x;
      cin >> x;
      s += x;
      if (s < m)
        m = s;
      else
        r = max(r, s-m);
    }
    cout << r << endl;
  }
}

C++: // 失敗するからこそ そこから立ち向かって行く強さがあってそんな強さが本当の強さだと私は思うから
#ifdef DAIJOBU
#include "/home/v-o_o-v/deb.h"
#define deb(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#include <bits/stdc++.h>
#define deb(x...)
#endif 
#include <climits>
using namespace std;
long double eps = 1e-9;
int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	int n;
	while(cin >> n){
		if(n == 0)break;
		int a[n];
		int sum = 0, ans = INT_MIN;
		for(int i = 0; i < n; i++){
			cin >> a[i];
			sum += a[i];
			ans = max(ans, sum);
			if(sum < 0)sum = 0;
		}
		cout << ans << '\n';
	}
	return 0;
}
// Write Here

C++: 
#include<stdio.h>
#include <iostream>
#include<bits/stdc++.h> 

using namespace std;
int length=0;
int* sums;

int main(){
  string str="";
  while(1){
  cin>>length;
  if(length==0)break;
  sums=new int[length+1];
  sums[0]=0;
  int s=0;
  for(int i=0;i<length;i++){
    int v=0;
    cin>>v;
    s+=v;
    sums[i+1]=s;
  }
  int max=INT_MIN;
  for(int i=0;i<length+1;i++){
    for(int j=i;j<length+1;j++){
      int diff=sums[j]-sums[i];
      if(diff>max){
        max=diff;
      }
    }
  }
  cout<<"\n";
  cout<<max;
  cout<<" ";
  }
  return 0;
}

C++: #include <iostream>
#include <stdio.h>
#include <algorithm>
using namespace std;

int main()
{
	int n;
	while (cin >> n)
	{
		int num[5001] = {};
		int maxim = -100001;
		if (n == 0) break;
		for (int i = 0; i < n; i++) cin >> num[i];
		for (int i = 0; i < n ; i++)
		{
			int sum = 0;
			for (int j = i; j < n; j++)
			{
				sum += num[j];
				maxim = (maxim >= sum) ? maxim : sum;
			}
		}
		cout << maxim << endl;
	}
	return 0;
}

C++: #include<iostream>
#include<stdio.h>
#include<math.h>
#include<string>
#include<algorithm>
#include<utility>
#include<vector>
using namespace std;
int main() {
	long long n, a[5001], rui[5002] = { 0 },ans[5002],cnt=0;
	while (1) {
		cnt++;
		cin >> n;
		if (n == 0)break;
		for (int i = 0; i < n; ++i) {
			cin >> a[i];
			rui[i + 1] = rui[i] + a[i];
		}
		int max = -100001;
		for (int i = 0; i <= n; ++i) {
			for (int j = i; j <= n; ++j) {
				if (rui[j] - rui[i] > max) {
					max = rui[j] - rui[i];
				}
			}
		}
		ans[cnt] = max;
	}
	for (int i = 1; i < cnt; ++i) {
		cout << ans[i] << endl;
	}
	return 0;
}

C++: #include <iostream>
#include <stack>
#include <stdio.h>
#include <cmath>
#include <utility>
using namespace std;
int main()
{
    int n;
	while(cin>>n&&n){
		int a[5000]={},sum[5000]={},m=-1000000;
		for(int i=0;i<n;i++){
			cin>>a[i];
			sum[i+1]=sum[i]+a[i];
		}
		for(int i=0;i<n;i++){//start
			for(int j=i;j<n;j++){//end
				int tmp=sum[j+1]-sum[i];
				//if(tmp<=0){i=j;break;}
				//printf("%d-%d:%d\n",i,j,tmp);
				m=max(m,tmp);
			}
		}
		cout<<m<<endl;
	}
    return 0;
}

C++: #include<iostream>
#include<algorithm>
using namespace std;

int main() {
	int n;
	while (cin >> n, n) {
		int k[5003];
		for (int i = 0;i < n;i++)cin >> k[i];

		int dp[5002];
		dp[0] = 0;
		for (int i = 1;i <= n;i++) {
			dp[i] = max(dp[i - 1] + k[i - 1], k[i - 1]);
		}

		int ans = 1e-8;
		for (int i = 1;i <= n;i++)ans = max(ans, dp[i]);
		cout << ans << endl;
	}
	return 0;
}

C++: #include <iostream>

int calcMaxSum(int amount_set);

int main()
{
    while (true) {
        int amount_set;
        std::cin >> amount_set;
        if(amount_set == 0) {
            break;
        }
        std::cout << calcMaxSum(amount_set) << std::endl;
    }

    return 0;
}

int calcMaxSum(int amount_set)
{
    const int MAXNUMBER = 100000;//??\????????????????????§??????

    int *data;
    data = new int[amount_set + 1];
    int *sum = new int[amount_set + 1];

    sum[0] = 0;//???????????????????????????????????´??????sum[0]??§??????

    std::cin >> data[1];//?????????????????±???
    sum[1] = data[1];//?????????????????????

    for (int number = 2; number <= amount_set; number++) {
        std::cin >> data[number];//????????????????????????
        sum[number] = sum[number - 1] + data[number];// ????????´??°
    }

    int max = -MAXNUMBER;//????????????????????¨??¨-MAXNUMBER???????????????????????§???????????????????????????????°????

    for (int number_big = 1; number_big < amount_set; number_big++) {
        for (int number_small = 0; number_small < number_big; number_small++)
            if (sum[number_big] - sum[number_small] > max) {
                max = sum[number_big] - sum[number_small];
            }
    }
    delete [] data;
    delete [] sum;

    return max;

}