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 <cstdio>
#include <cstdlib>
#include <iostream>
#include <algorithm>
#include <cstring>
#include <string.h>
#include <queue>
#include <stack>
#include <utility>
#include <queue>
#include <cmath>
#define mp make_pair
#define pii pair<int,int> 
#define ff first
#define ss second

using namespace std;

int n;
int list[10000],dp[10000];
int hasil;

int main()
{
	while(1)
	{
		scanf("%d",&n);
		if(n==0)
		break;
		hasil=-1000000;
		dp[0]=0;
		for(int a=1;a<=n;a++)
		{
			scanf("%d",&list[a]);
		}
		for(int a=1;a<=n;a++)
		{
			if(dp[a-1]>=0)
			{
				dp[a]=dp[a-1]+list[a];
			}
			else
			{
				dp[a]=list[a];
			}
			hasil=max(hasil,dp[a]);
		}
		/*for(int a=0;a<=n;a++)
		{
			printf("%d ",dp[a]);
		}*/
		printf("%d\n",hasil);
	}
	return 0;
}

C++: #include <iostream>
using namespace std;
 
int main() {
  int n,i,j,k,max,sum;
  while(1){
    int max=-100000;
    cin>>n;
    int a[n];
    if (n==0) break;
    for (i=0;i<n;i++){
      cin>>a[i];
    }
    for (i=0;i<n;i++){
      for (j=1;j<=n-i;j++){
        sum=0;
        for (k=i;k<j;k++){
          sum=sum+a[k];
        }
        if (max<sum) max=sum;
      }
    }
    cout<<max<<endl;
  }
}

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

int main()
{
	int n, a[5000], i, j, k, l, sum, max;

	while (cin >> n)
	{
		if (n == 0) break;

		for (i = 0; i < n; i++)
			cin >> a[i];

		max = INT_MIN;
		for (i = 0; i < n; i++)
		{
			for (j = 0; j < n - i; j++)
			{
				for (k = 0; k < n - i; k++)
				{
					sum = 0;
					for (l = k; l <= i; l++)
						sum += a[l];
					if (sum > max) max = sum;
				}
			}
		}
		cout << max << 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;
		max = -100001;
		for (int i = 0; i <= n; ++i) {
			for (int j = i+1; 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>
using namespace std;
#define N_MAX 5000
int array[N_MAX];
int main(){
	int n;
	int num;
	while(cin>>n&&n){
		int ans=-100000*5000;
		for(int i=0;i<n;i++){
			cin>>num;
			if(i==0)array[i]=num;
			else{
				array[i]=max(array[i-1]+num,num);
			}
			ans=max(ans,array[i]);
		}
		cout<<ans<<endl;
	}
	return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <vector>
#include <set>
#include <map>
#include <list>
#include <iterator>
#include <queue>
#include <stack>
#include <deque>
#include <sstream>
#include <algorithm>
#include <numeric>
#include <string>
#include <cmath>
#include <complex>
#include <functional>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cassert>
#include <cstdlib>
#include <cctype>

#define REP(i,m,n) for(int i=m;i<(int)n;i++)
#define rep(i,n) for(int i=0;i<(int)n;i++)
#define rp(i,c) rep(i,(int)c.size())
#define fr(i,c) for(__typeof((c).begin()) i=(c).begin();i!=(c).end();i++)
#define mp make_pair
#define pb push_back
#define all(c) (c).begin(),(c).end()
#define rall(u) (u).rbegin(),(u).rend()
#define dbg(x) cerr<<#x<<" = "<<(x)<<endl
#define v_delete(a,b) (a).erase(remove((a).begin(), (a).end(), b), (a).end())
#define v_unique(a) (a).erase(unique((a).begin(), (a).end()), (a).end())
#define VV(T) vector<vector< T > >
#define init(a,b) memset((a), (b), sizeof((a)))
using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pi;
const int inf=1<<28;
const double INF=1e10,EPS=1e-9;


template<class T>int SIZE(T a){return a.size();}
template<class T>string IntToString(T num){string res;stringstream ss;ss<<num;return ss.str();}
template<class T>T StringToInt(string str){T res=0;for(int i=0;i<SIZE(str);i++)res=(res*10+str[i]-'0');return res;}
template<class T>T gcd(T a,T b){if(b==0)return a;return gcd(b,a%b);}
template<class T>T lcm(T a,T b){return a/gcd(a,b)*b;}

template <class T> void input(T& a, int n) { for (int i = 0; i < n; ++i) cin >> a[i]; }
template <class T> void input(T* a, int n) { for (int i = 0; i < n; ++i) cin >> a[i]; }
typedef pair<int,int> pii;


int main()
{
	int n;
	cin >> n;
	while(n!=0){
		vector<int>dp;
		dp.pb(0);
		rep(i,n){
			int t;
			cin >> t;
			dp.pb(dp[i]+t);
		}
		int mx=0;
		rp(i,dp){
			REP(j,i+1,dp.size()){
				mx=max(mx,dp[j]-dp[i]);
			}
		}
		cout << mx << endl;
	}
	return 0;
}

C++: #include <iostream>

using namespace std;

int s[5000];

int main() {
  for (;;) {
    int n;
    cin >> n;
    if (!n) return 0;
    cin >> s[0];
    int r = s[0], m = 0;
    for (int i = 1; i < n; i++) {
      cin >> s[i];
      r = max(r, s[i]);
      s[i] += s[i-1];
    }
    for (int i = 0; i < n; i++)
      if (s[i] < m)
        m = s[i];
      else
        r = max(r, s[i]-m);
    cout << r << endl;
  }
}

C++: #include <stdio.h>
#include <limits.h>
#include <iostream>
#include <cstdio>
#include <algorithm>
#define swap(type, x, y) do{type temp = x; x = y; y = temp;}while(0);
using namespace std;
void quick_sort(long long int x[], int left, int right);
int main(void) {
    int num;
    
    while(1) {
        scanf("%d", &num);
        if(num == 0) break;
        
        long long int sum[num + 1];
        int i, value;
        
        for(i = 0; i < num + 1; i++) {
            sum[i] = 0;
        }
        
        for(i = 0; i < num; i++) {
            scanf("%d", &value);
            sum[i + 1] += sum[i] + value;
        }
        quick_sort(sum, 1, num);
        
        cout << sum[1] << endl;
    }
    
    return(0);
}

void quick_sort(long long int x[], int left, int right) {
    int i, j;
    long long int pivot;
    
    i = left;
    j = right;
    pivot = x[(left + right) / 2];
    
    while(1) {
        while(x[i] > pivot) i++;
        while(x[j] < pivot) j--;
        
        if(i >= j) break;
        
        swap(long long int, x[i], x[j]);
        i++;
        j--;
    }
    if(i - 1 > left) quick_sort(x, left, i - 1);
    if(j + 1 < right) quick_sort(x, j + 1, right);
}

C++: #include<stdio.h>
int main(){
    int a;
    while(1){
        scanf("%d",&a);
        if(a==0)return 0;
        int n[5000];
        for(int i=0;i<a;i++)scanf("%d",n+i);
        int dp[5000];
        dp[0]=n[0];
        int max=0;
        for(int i=1;i<a;i++){
            if(dp[i-1]>0)dp[i]=dp[i-1]+n[i];
            else dp[i]=n[i];
            if(max<dp[i])max=dp[i];
        }
        printf("%d\n",max);
    }
}

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

int main(){
  int n;
  int a[5000];
  while(cin >> n && n>0){
    for(int i=0;i<n;i++)
      cin >> a[i];
    long long sum=0,tmp=0,ma=-100000;
    int m=-100000;
    bool flg=true;
    for(int i=0;i<n;i++){
      if(flg) m=max(m,a[i]);
      if(a[i]>0){
	flg=false;
	sum+=a[i];
	continue;
      }
      ma=ma>sum?ma:sum;
      for(tmp=sum;i<n && a[i]<=0;i++){
	tmp+=a[i];
      }i--;
      if(tmp>0)
	sum=tmp;
      else
	sum=0;
    }
    ma=ma>sum?ma:sum;

    cout << (flg?m:ma) << endl;
  }
}