Go: package main

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

var scanner = bufio.NewScanner(os.Stdin)

func nextInt() int {
	scanner.Scan()
	i, e := strconv.Atoi(scanner.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func max(x, y int) int {
	if x > y {
		return x
	} else {
		return y
	}
}

func main() {
	sum := make([]int, 5001)
	for {
		n := nextInt()
		if n == 0 {
			break
		}
		for i := 0; i < n; i++ {
			a := nextInt()
			sum[i+1] = sum[i]+a
		}
		ret := sum[1]
		for i := 0; i <= n; i++ {
			for j := i + 1; j <= n; j++ {
				ret = max(ret, sum[j]-sum[i])
			}
		}
		fmt.Println(ret)
	}
}

C++: #include<iostream>
using namespace std;
int main(){
	long int n, m[5000] = { 0 }, max = -2147483647, temp = 0;
	while (cin>> n && n!=0){
		for (int i = 0; i < n; i++){
			cin >> m[i];
		}
		for (int i = 0; i < n; i++){
			temp = m[i];
			for (int l = i + 1; l < n; l++){
				temp += m[l];
				if (max < temp){
					max = temp;
				}
			}temp = 0;
		}for (int i = n - 1; i >= 0; i--){
			temp = m[i];
			for (int l = i-1; l >= 0; l--){
				temp += m[l];
				if (max < temp){
					max = temp;
				}
			}temp = 0;
		}
		cout << max << endl;
		max = -2147483647;
	}
	return 0;
}

C++: include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<algorithm>
using namespace std;
int main(){
  int n,k[5000],max;
  while(1){
  cin >> n;
  if(n==0)break;
  for(int i=0;i<n;i++){
    cin >> k[i];
  }
  max=0;
  int sum=0;
  for(int i=0;i<n;i++,sum=0){
    for(int j=i;j<n;j++){
      sum += k[j];
      if(sum>max){
	max=sum;
      }
    }
  }   
  cout << max << endl;
  }
}

C++: #include <iostream>
#include <cstdio>
using namespace std;
int main(){
	int n;
	while(1){
		cin >> n;
		if(n==0) break;
		int a[n];
		for(int i=0;i<n;i++) cin >> a[i];
		int max = -1000000;
		for(int i=0;i<n;i++){
			int b = 0;
			for(int j=i;j<n;j++){
				b += a[j];
				if(max<b) max = b;
			}
		}
		cout << max << endl;
	}
}

C++: #include <stdio.h>
int array[5000];
int n,i,sum=-50000,k=-50000;
void tansaku(int a)
{
	k += array[a];
	if(k > sum)
	{
		sum = k;
	}
	if(a == n-1)return;
	tansaku(a+1);
}
int main(void)
{
	while(1)
	{
		sum = 0;
		for(i=0;i<5000;i++)
		{
			array[i] = 0;
		}
		scanf("%d",&n);
		if(n==0)break;
		for(i=0;i<n;i++)
		{
			scanf("%d",&array[i]);
		}
		for(i=0;i<n;i++)
		{
			tansaku(i);
			k = 0;
		}
		printf("%d\n",sum);
	}
	return 0;
}

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

using namespace std;

int debug = 0;

int main(void){
	int n, m, i, j, k;
	int tmp, max;
	bool first = 0, notAllMinus=0;
	vector<int> intv;

	while(cin >> n){
		if(n == 0){
			break;
		}else{
			//ÇÝÝ
			for(i=0;i<n;i++){
				cin >> m;
				intv.push_back(m);
				//if(debug) cout << "int[" << i << "] =" << intv[i] << endl; 
			}

			//SÌêÌ»è
			tmp = intv[0];
			for(i=0;i<intv.size();i++){
				if(intv[i] > 0){
					notAllMinus = 1;
					break;
				}else{
					if(tmp < intv[i]){
						tmp = intv[i];
					}
				}
			}

			if(notAllMinus == 0){
				cout << tmp << endl;
				notAllMinus == 1;
				continue;
			}

			//vfð¸ç·
			tmp=0;
			for(i=1;i<intv.size();i++){
				if(intv[tmp] > 0){
					if(intv[i] > 0){ //¯Èç
						intv[tmp] += intv[i];
						intv[i] = 0;
					}else{ //ÙÈç
						tmp = i;
					}
				}else if(intv[tmp] < 0){
					if(intv[i] < 0){
						intv[tmp] += intv[i];
						intv[i] = 0;
					}else{
						tmp = i;
					}
				}
			}
			/*
			if(debug){
				for(i=0;i<intv.size();i++){
					cout << intv[i] <<endl;
				}
				cout << "----------------------" << endl;
			}
			*/
			intv.erase( remove(intv.begin(), intv.end(), 0), intv.end());
			/*
			if(debug){
				for(i=0;i<intv.size();i++){
					cout << intv[i] <<endl;
				}
			}
			*/

			int vsize = intv.size();
			for(i=1;i<=vsize;i+=2){//i:Â
				//if(debug) cout << "number =" << i << endl;
				for(j=0;j<=vsize-1-i+1;j++){ //j:JnÊu
					tmp = 0;
					for(k=0;k<i;k++){
						tmp += intv[j+k];
					}
					//if(debug) cout << "tmp ==" << tmp << endl;
					if(first == false){
						max = tmp;
						first = true;
					}else if(max < tmp){
						max = tmp;
					}
				}
			}
			cout << max << endl;
			intv.clear();
			first = false;
		}
	}
	return 0;
}

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

int main() {
  int x,n,nextsum;
  int a[5000];
  long int sum;
  while(cin >> n) {
    if(n == 0) break;
    for(int i=0;i<n;i++) {
      cin >> x;
      a[i] = x;
    }
    /*  for(int j=0;j<n;j++) {
        for(int i=j+1;j<n;i++) {
        for(int m=0;m<i-j;m++) {
        sum[k] += a[j+m];
        }
        k++;
        }
        }
        cout << *max_element(sum,sum+k) << endl;
    */
    //全パターン生成はむり
    sum = 0;
    for(int i=0;i<n;i++) {
      if(a[i] >= 0) {
        nextsum = a[i];
        for(int j=1;j<n-i;j++) {
          nextsum += a[i+j];
          if(nextsum > sum)
            sum = nextsum;
        }
      }

    }
    cout << sum << endl;
  }
}

C++: #include<iostream>
using namespace std;
int main()
{
int n;
while(cin>>n)
if(n==0)
{
	break;
}
else
{
int a[n];
int r[5000];
for(int h=0;h<5000;h++)
{
	r[h]=-100001;
}
for(int i=0;i<n;i++)
{
	cin>>a[i];
}
for(int j=0;j<n;j++)
{
	r[j]=a[j];
	if(a[j]<0)
	{}
	else
	{
		for(int k=j+1;k<n;k++)
		{
			if(a[k]<0)
			{
				break;
			}
			else
			{
				r[j]+=a[k];	
			}
		}
		
	}
}
int l=0;
	while(r[0]!=-100001)
	{
		if(r[l]>r[0])
		{
			r[0]=r[l];
			l++;
		}
	}
}
return 0;
}

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

int main(){
	int n;
	cin >> n;
	while(n != 0){	

		int a[n];
		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 >> a[i];
		}
		int maximum = 0;
		

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

	return 0;
}

C++: #include <iostream>

#define max(X,Y) ((X > Y)?X:Y)

int main(void)
{
	while(true)
	{
		int n;
		int m=0,prev=0;
		std::cin >> n;
		if(!n)
			break;

		max = prev = -1000001;
		for(int i=0; i<n; i++)
		{
			int a;
			std::cin >> a;
			prev = max( a, prev + a );
			m = max( m, prev );
		}
		std::cout << m << std::endl;
	}
	return 0;
}

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

int main() {
	long long int n, a;
	vector<long long int> an;
	vector<vector<long long int>> AN;
	while (cin >> n) {
		if (n == 0)break;
		for (int i = 0; i < n; i++) {
			cin >> a;
			an.push_back(a);
		}
		AN.push_back(an); an.clear();
	}

	for (int i = 0; i < AN.size(); i++) {
		long long int max = 0, MAX = 0 , counter = 0;
		for (int j = 0; j < AN[i].size(); j++) {
			if (AN[i][j] >= 0) {
				max += AN[i][j];
				if (MAX < max)MAX = max;
				counter = 1;
			}
			else {
				if (counter==1){
					if (AN[i][j] + max >= 0)max += AN[i][j];
					else {
						max = 0;
						counter = 0;
					}
				}
			}
		}
		cout << MAX << endl;
	}
	
	return 0;
}

C++: #include<iostream>
#include<string>
#include<algorithm>
#include<map>
#include<vector>
#include<cmath>
#include<cstdio>
#define loop(i,a,b) for(int i=a;i<b;i++) 
#define rep(i,a) loop(i,0,a)
#define pb(in,tmp) in.push_back(tmp)
#define all(in) in.begin(),in.end()
const double PI=acos(-1);
using namespace std;
int main(){
  int n;
  while(cin>>n,n){
    vector<int>(n);
    rep(i,n)cin>>in[i];
    int max=0;
    rep(i,n){
      int sum=0;
      loop(j,i,n){
	sum+=in[j];
	if(max<sum)max=sum;
      }
    }
    cout<<max<<endl;
  }


}