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ALTSEQ.cpp
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ALTSEQ.cpp
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/*My First Template :D*/
#include <bits/stdc++.h>
#include <limits.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<int> vi;
#define MOD (ll)1000000007
#define pb push_back
#define EPS 1e-9
#define FOR(i,n) for(int i = 0;i < n; i++)
#define FORE(i,a,b) for(int i = a;i <= b; i++)
#define pi(a) printf("%d\n", a)
#define all(c) c.begin(), c.end()
#define tr(container, it) for(typeof(container.begin()) it = container.begin(); it != container.end(); it++)
#define gc getchar_unlocked
#define sdi(a, b) si(a);si(b)
#define io ios_base::sync_with_stdio(false);cin.tie(NULL);
#define endl '\n'
#define F first
#define S second
template <typename T> T gcd(T a, T b){return (b==0)?a:gcd(b,a%b);}
template <typename T> T lcm(T a, T b){return a*(b/gcd(a,b));}
template <typename T> T mod_exp(T b, T p, T m){T x = 1;while(p){if(p&1)x=(x*b)%m;b=(b*b)%m;p=p>>1;}return x;}
template <typename T> T invFermat(T a, T p){return mod_exp(a, p-2, p);}
template <typename T> T exp(T b, T p){T x = 1;while(p){if(p&1)x=(x*b);b=(b*b);p=p>>1;}return x;}
void si(int &x){
register int c = gc();
x = 0;
int neg = 0;
for(;((c<48 || c>57) && c != '-');c = gc());
if(c=='-') {neg=1;c=gc();}
for(;c>47 && c<58;c = gc()) {x = (x<<1) + (x<<3) + c - 48;}
if(neg) x=-x;
}
int main(){
io;
int n;
cin >> n;
int arr[n];
FOR(i,n) cin >> arr[i];
int lis[n];
FOR(i,n) lis[i] = 1;
for(int i = 1;i < n; i++){
int sign;
if(arr[i] > 0)
sign = 1;
else
sign = -1;
for(int j = 0;j < i; j++){
int sign2;
if(arr[j] < 0)
sign2 = -1;
else
sign2 = 1;
if(abs(arr[j]) < abs(arr[i]) && sign2*sign == -1){
lis[i] = max(lis[i], 1+lis[j]);
}
}
}
int maxx = INT_MIN;
for(int i = 0;i < n; i++){
maxx = max(maxx, lis[i]);
}
cout << maxx << endl;
return 0;
}