Submission #892402

#	Time	Username	Problem	Language	Result	Execution time	Memory
892402		LeVanThuc	Bigger segments (IZhO19_segments)	C++17	0 / 100	6 ms	25432 KiB

segments

#include<bits/stdc++.h>
using namespace std;
#define ll int
#define fi first
#define se second
#define p(x,y) pair<ll,ll>(x,y)
#define BIT(i,x) ((x>>i)&1)
#define MASK(x) (1<<x)
#define ld long double
#define __builtin_popcount __builtin_popcountll
#define pll pair<ll,ll>
#define kt cerr << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n"
template<class T1,class T2>
bool maximize(T1 &x,T2 y)
{
    if(x<y)
    {
        x=y;
        return 1;
    }
    return 0;
}
template<class T1,class T2>
bool minimize(T1 &x,T2 y)
{
    if(y<x)
    {
        x=y;
        return 1;
    }
    return 0;
}
const ll M=1e9+7;
template <class T1,class T2>
void add(T1 &x,T2 y)
{
    x+=y;
    if(x>=M) x-=M;
}
template <class T1,class T2>
void sub(T1 &x, T2 y)
{
    x-=y;
    if(x<0) x+=M;
}
void online()
{
    std::ios_base::sync_with_stdio(0);
    cin.tie(0);
#ifdef thuc
    freopen("input.inp","r",stdin);
    freopen("output.out","w",stdout);
#else
#endif // thuc
}
const ll N=5e5+10,S=400;
ll n,a[N];
vector<pll> f1[N],f2[N];
void them(ll i,ll l,ll vl)
{
    l++;
    if(f1[i].back().se==vl)
    {
        f1[i].emplace_back(l,vl);
        return;
    }
    if(f2[i].size()&&f2[i].back().se==vl)
    {
        f2[i].emplace_back(l,vl);
        return;
    }
    else if(f2[i].empty()||f2[i].back().se<vl)
    {
        f2[i].clear();
        f2[i].emplace_back(l,vl);
        if(f1[i].back().se<f2[i].back().se) f1[i].swap(f2[i]);
        return;
    }
}
int main()
{
    online();
    cin>>n;
    for(int i=1; i<=n; i++)
    {
        cin>>a[i];
        a[i]+=a[i-1];
    }
    a[n+1]=a[n];
    ll ans=1;
    for(int i=1; i<=n; i++)
    {
        f1[i].emplace_back(1,1);
    }
    for(int i=1; i<=n; i++)
    {
        sort(f1[i].begin(),f1[i].end());
        if(f1[i].size())
        {
            ll l=f1[i].back().fi,vl=f1[i].back().se;
            ll sum=a[i]-a[l-1];
            ll r=i;
            ll d=n/2;
            while(d)
            {
                while(r+d<=n&&a[r+d]-a[i]<sum) r+=d;
                d/=2;
            }
            r++;
            if(a[r]-a[i]>=sum)
            {
                vl++;
                them(r,i,vl);
            }
        }
        if(f2[i].size())
        {
            sort(f2[i].begin(),f2[i].end());
            ll l=f2[i].back().fi,vl=f2[i].back().se;
            ll sum=a[i]-a[l-1];
            ll r=i;
            ll d=n/2;
            while(d)
            {
                while(r+d<=n&&a[r+d]-a[i]<sum) r+=d;
                d/=2;
            }
            r++;
            if(a[r]-a[i]>=sum)
            {
                vl++;
                them(r,i,vl);
            }
        }
    }
    maximize(ans,f1[n].back().se);
    cout<<ans;
    kt;
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27