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alternating subsequence codeforces
“alternating subsequence codeforces” Code Answer
alternating subsequence codeforces
cpp by
Poor Puma
on Sep 01 2020
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#include<bits/stdc++.h>using namespace std; typedef long long ll;typedef long long int li;#define pb push_back#define ff first#define ss second#define FOR(n) for(int i=0;i<n;i++)#define FORD(n) for(int i=n-1;i>=0;i--) int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); //your code starts here ll t; cin>>t; while(t--) { ll n; cin>>n; vector<ll> a(n); for(int i=0;i<n;i++) cin>>a[i]; deque<ll> st; st.push_front(a[0]); int init_sign=a[0]/abs(a[0]); for(int i=1;i<n;i++) { int sign=a[i]/abs(a[i]); if(init_sign!=sign) st.push_front(a[i]); else { if(a[i]>st.front()) { st.pop_front(); st.push_front(a[i]); } } init_sign=sign; } ll ans=0; for(auto x:st) ans+=x; cout<<ans<<"\n"; } return 0;}
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