This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#define deb(...) logger(#__VA_ARGS__, __VA_ARGS__)
template<typename ...Args>
void logger(string vars, Args&&... values) {
cerr<<vars<<" = ";
string delim="";
(...,(cerr<<delim<<values,delim=", "));
cerr<<"\n";
}
#else
#define deb(...) logger(#__VA_ARGS__, __VA_ARGS__)
template<typename ...Args>
void logger(string vars, Args&&... values) {}
#endif
#define pb push_back
#define sz(x) (int)(x.size())
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
template<typename T> inline void maxa(T& a,T b){a=max(a,b);}
template<typename T> inline void mina(T& a,T b){a=min(a,b);}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int mxN=5e3+5; //make sure this is right
const int mod=1e9+7;
int dp[mxN][mxN],a[mxN],cnt[mxN][mxN],ptr[mxN][mxN];
int main(){
cin.sync_with_stdio(0);
cin.tie(0); cout.tie(0);
#ifdef LOCAL
freopen("input.txt","r",stdin);
freopen("output.txt","w",stdout);
#endif
int n; cin>>n;
for(int i=1;i<=n;i++)
cin>>a[i];
for(int i=1;i<=n;i++){
int p=i-1;
int s1=0; int s2=0;
for(int j=i;j<=n;j++){
dp[i][j]=dp[i-1][i-1];
cnt[i][j]=cnt[i][j-1];
s1+=a[j];
while(p && s2+a[p]<=s1)
s2+=a[p--];
if(s1==s2)
cnt[i][j]++;
ptr[i][j]=p;
maxa(dp[i][j],cnt[i][j-1]+dp[ptr[i][j-1]][i-1]);
maxa(dp[i][j],dp[i-1][j]);
}
}
cout<<dp[n][n]<<"\n";
}
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