Submission #1128132

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128132		MrPavlito	Divide and conquer (IZhO14_divide)	C++20	100 / 100	41 ms	7464 KiB

divide

#include <bits/stdc++.h>
#define int long long
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define sc second
#define endl "\n"
#define pii pair<int,int>

using namespace std;

const int MAXN = 1e5+5;
const int mod7 = 1e9+7;
const long long inf = 1e18;

struct rudnik{int x,g,d;};

vector<int> seg(MAXN<<2, -inf);

void update(int nod, int tl, int tr, int index, int v)
{
    if(tl == tr)
    {
        seg[nod] = v;
        return;
    }
    int mid = tl+tr>>1;
    if(index<=mid)update(nod<<1, tl, mid, index, v);
    else update(nod<<1|1, mid+1, tr, index, v);
    seg[nod] = max(seg[nod<<1], seg[nod<<1|1]);
}

int get(int nod, int tl, int tr, int v)
{
    if(tl == tr)return tl;
    int mid = tl+tr>>1;
    if(seg[nod<<1] >= v)return get(nod<<1, tl, mid, v);
    else if(seg[nod<<1|1] >= v)return get(nod<<1|1, mid+1, tr, v);
    return -1;
}

signed main()
{
    ios_base::sync_with_stdio(false),cin.tie(0), cout.tie(0);
    int tt=1;
    //cin >> tt;
    while(tt--)
    {
        int n;
        cin >> n;
        vector<rudnik>svi(n);
        int mx = 0;
        for(int i=0; i<n; i++)cin >> svi[i].x >> svi[i].g >> svi[i].d, mx = max(mx, svi[i].g);
        vector<int> prefd(n+1, 0);
        vector<int> prefg(n+1, 0);
        for(int i=0; i<n; i++)prefd[i+1] = prefd[i] + svi[i].d;
        for(int i=0; i<n; i++)prefg[i+1] = prefg[i] + svi[i].g;
        for(int i = 0;i<n; i++)
        {
            int tr = svi[i].x - prefd[i+1];
            int index = get(1,1,n, tr);
            if(index != -1)mx = max(mx, prefg[i+1] - prefg[index-1]);
            update(1,1,n,i+1,svi[i].x - prefd[i]);
        }
        cout << mx << endl;
    }
}

• Subtask 1: 17 / 17
• Subtask 2: 31 / 31
• Subtask 3: 52 / 52