Submission #380547

#	Time	Username	Problem	Language	Result	Execution time	Memory
380547		YJU	Bigger segments (IZhO19_segments)	C++14	100 / 100	106 ms	17024 KiB

segments

#include<bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector,Ofast")
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef long double ld;
const ll N=5e5+5;
const ll MOD=1e9+7;
const ll INF=(1LL<<60);
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define lwb lower_bound
#define SZ(_a) (ll)_a.size()

ll n,u[N],dp[N],pos[N];

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
    cin>>n;
    REP1(i,n)cin>>u[i],u[i]+=u[i-1];
    REP1(i,n){
		pos[i]=max(pos[i],pos[i-1]);
		dp[i]=dp[pos[i]]+1;
		ll idx=lwb(u+1,u+n+1,2*u[i]-u[pos[i]])-u;
		pos[idx]=max(pos[idx],i);
    }
    cout<<dp[n]<<"\n";
	return 0;
}

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 36 / 36
• Subtask 5: 27 / 27