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 <cstdio>
#include <cstring>
#include <string>
#include <cmath>
#include <cassert>
#include <iostream>
#include <algorithm>
#include <stack>
#include <queue>
#include <vector>
#include <set>
#include <map>
#include <bitset>
#include <functional>
#include <sstream>
#include <utility>
#include <cstdlib>
#include <cctype>
#include <climits>
#include <fstream>

using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<long long> vl;
typedef vector<double> vd;
typedef vector<pair<int, int> > vpii;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define rep(i,n) for(int i=0;i<(n);++i)
#define foreach(itr,c) for(__typeof(c.begin()) itr=c.begin(); itr!=c.end(); itr++)
#define dbg(x) cout << #x"="<< (x) << endl
#define mp(a,b) make_pair((a),(b))
#define pb(a) push_back(a) 
#define in(x) cin >> x;
#define all(x) (x).begin(), (x).end()
#define INF 2147483600
#define fi first
#define se second
using namespace std;

int main(){
	int N;
	int x;
	while(1){cin>>N;if(N==0) break;int index=0;
		vl v(N*N),sum(N);
		FOR(i,1,N+1){
			cin>>sum[i];
			sum[i] += sum[i-1];
		}
		rep(i,N+1){
			FOR(j,i+2,N+1){
				v[index] = sum[j]-sum[i];
				index++;
			}
		}
		cout<< *max_element(all(v)) <<endl;
	}
}

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

int main(void) {
  int n, a[5001];
  long long int sum, mx;
  
  while(cin>>n, n) {
    for(int i = 0; i < n; i++) cin >> a[i];
    mx=0;
    for(int i = 0; i < n; i++) {
      sum=0;
      for(int j = i; j < n; j++) {
	sum+=a[j];
	mx=max(mx, sum);
      }
    }
    cout<<mx<<endl;
  }

  return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <cmath>
#include <utility>

#define ll (long long)
#define REP(i,n) for(int i = 0;i<(int)n;i++)
#define FOR(i,a,b) for(int i = (a);i < (b);i++)
#define RFOR(i,a,b) for(int i = (a);i>(b);i--)


using namespace std;

int main (void){
  
    int number;
    int max;
    int l = 0;
    while(cin >> number,number)
    {
        int a[5010] = {0};
        vector<int>tempmax2(5010,0);
        int temp = 0;
        REP(i,number)
        cin >> a[i];
        for(int j = 0; j<number;j++)
            for(int k = j;k<number;k++)
            {
                for(int l = k;l<number;l++)
                {
                    if(k == l)
                        tempmax2[k] = a[k];
                    else{
                        
                        tempmax2[k] += a[l];
                    }
                    if(temp <= tempmax2[k])
                        temp = tempmax2[k];
                }
            
            }
        //sort(tempmax.begin(),tempmax.end(),greater<int>());
        //sort(tempmax2.begin(),tempmax2.end(),greater<int>());
        //if(tempmax[0]>temp)
            //answer[l] = tempmax[0];
        //else
        // answer[l] = temp;
        printf("%d\n",temp);
        temp = 0;
    }
    return 0;
}

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

int main(){
	int n;
	cin >> n;
	while(n != 0){
		int sum[n][n];
		for (int i = 0; i < n; ++i){
			for (int j = 0; j < n; ++j){
				sum[i][j] = 0;
			}
		}

		for (int i = 0; i < n; ++i){
			cin >> sum[i][0];
		}

		int maximum = 0;
		for(int i = 0; i < n - 1; i++){
			for(int j = 1; j < n - i; j++){
				sum[i][j] = sum[i][j-1] + sum[i+j][0];
				maximum = max(maximum, sum[i][j]);
			}
		}

		cout << maximum << endl;
		cin >> n;
	}
	return 0;
}

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

int main() {
int n,b;
int a[5001];
while(1){
	cin>>n;
	if(n==0){
		break;
	}
	for (int kkk=1;kkk<=n;kkk++){
		a[kkk]=0;
	}
	for (int kk=1;kk<=n;kk++){
		cin>>b;
		a[kk]=b;
	}
	int high=a[1];
	for (int k=1;k<=n;k++){
		for(int l=k;l<=n;l++){
			int sum=0;
			for(int m=k;m<=l;m++){
				sum=sum+a[m];
				if(sum>=high){
		high=sum;
			}
		}
	}
	
	}
cout<<high<<endl;
}
	return 0;
}

C++: 
#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <algorithm>
#include <cmath>
#include <string>
#include <cstring>
#include <vector>
#include <map>
#include <utility>
#include <complex>
#include <stack>
#include <climits>

using namespace std;

double sq(double x){return x*x;}

int a[5001];

int main(){
	int n;
	while(cin>>n,n){
		for (int i = 0; i < n; i++){
			cin>>a[i+1];
			a[i+1] += a[i];
		}
		int ans = INT_MIN;
		for (int i = 0; i < n; i++)
		{
			for (int j = 0; j < i; j++)
			{
				ans = max(ans,a[i+1] - a[j]);
			}
		}
		cout << ans << endl;
	}

	return 0;
}

C++: //Maximum Sum Sequence
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

int main(){
  int n;
  while(true){
    ll max=0, tmp=0, d;
    cin>>n;
    if(n==0)break;
    for(int i=0; i<n; i++){
      cin>>d;
      tmp=(tmp>0 ? tmp+d : d);
      if(max<tmp)max=tmp;
    }
    cout<<max<<endl;
  }
  return 0;
}

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

int main()
{
	int N;
	while(cin>>N && N){
	
		vector<int> n(N), dp(N);
		for(int i=0;i<N;i++){
			cin>>n[i];
		}
		int ans = -1<<29;
		int dp[5000];
		for(int i=0;i<a;i++){
			if(i-1 >= 0 && dp[i-1]>0){
				dp[i] += dp[i-1] + n[i];
			}else{
				dp[i] = n[i];
			}
			ans = max(ans, dp[i]);
		}
		
		cout<<max_ret<<endl;
	}
	
	
	return 0;
}

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

int main() {
	int i, j, n, a, max_so_far, max_ending_here;
	
	while (1) {
		cin >> n;
		if (n == 0)break;
		max_so_far = 0;
		max_ending_here = 0;
		for (i = 0; i < n; i++) {
			cin >> a;
			max_ending_here = max_ending_here + a;
			if (max_ending_here < 0)max_ending_here = 0;
			if (max_so_far < max_ending_here)max_so_far = max_ending_here;
		}
		cout << max_so_far << endl;

	}

	return 0;
}

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

using namespace std;

int main(){
	while(true) {
		long long int n, tmp;
		cin >> n;
		if (n<=0) {
			//cout << 0 << endl;
			return 0;
		}
		vector<long long int> intervalos;
		intervalos.reserve(n);
		cin >> tmp;
		bool esNegativo = tmp < 0;
		intervalos.push_back(tmp);
		for (int i = 1; i < n; ++i){
			cin >> tmp;
			if (esNegativo == tmp < 0){
				intervalos.back() += tmp;
			} else {
				intervalos.push_back(tmp);
				esNegativo ^= true;
			}
		}
		long long int best = 0;
		long long int current = 0;
		for (int i = 0; i < intervalos.size(); ++i){
			if (intervalos[i]+current <= 0) {
				current = 0;
			} else {
				current+=intervalos[i];
				if (current > best) {
					best=current;
				}
			}
		}
		intervalos.clear();
		cout << best << endl;
		}
	
}

C++: #include<stdio.h>

int main()
{
	int n;
	while(scanf("%d",&n))
	{
		if(n==0){return 0;}
		
		if( n >= 1 && n <= 5000){
		int a[5000]={0},max=0;
		for(int x=0;x<n;x++)
		{
			scanf("%d",&a[x]);

			for(int y=0;y<=x;y++)
			{
				if(y!=x)
				{
					a[y]+=a[x];
				}
				if(max<a[y])
				{
					max=a[y];
				}
			}
		}
		printf("%d\n",max);
		}
	}
}