Submission #585932

#	Time	Username	Problem	Language	Result	Execution time	Memory
585932		tamthegod	Divide and conquer (IZhO14_divide)	C++14	100 / 100	174 ms	51012 KiB

divide

#include<bits/stdc++.h>

#define int long long
#define pb push_back
#define fi first
#define se second
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 1e6 + 5;
const int mod = 1e9 + 7;
const ll oo = 1e18;
int n;
int x[maxN], g[maxN], d[maxN];
pair<int, int> sum[maxN];
map<int, int> nerf;
void ReadInput()
{
    vector<int> vc;
    cin >> n;
    for(int i=1; i<=n; i++)
    {
        cin >> x[i] >> g[i] >> d[i];
        sum[i] = {sum[i - 1].fi + g[i], sum[i - 1].se + d[i]};
        vc.pb(sum[i].se - x[i]);
        vc.pb(sum[i - 1].se - x[i]);
    }
    vc.pb(0);
    sort(vc.begin(), vc.end());
    int p = 0;
    for(int v : vc)
    {
        if(nerf[v]) continue;
        nerf[v] = ++p;
    }
}
int st[4 * maxN];
void update(int id, int l, int r, int pos, int val)
{
    if(l > pos || r < pos) return;
    if(l == r && l == pos)
    {
        st[id] = min(st[id], val);
        return;
    }
    int mid = (l + r) / 2;
    update(id * 2, l, mid, pos, val);
    update(id * 2 + 1, mid + 1, r, pos, val);
    st[id] = min(st[id * 2], st[id * 2 + 1]);
}
int get(int id, int l, int r, int u, int v)
{
    if(l > v || r < u) return oo;
    if(l >= u && r <= v) return st[id];
    int mid = (l + r) / 2;
    return min(get(id * 2, l, mid, u, v), get(id * 2 + 1, mid + 1, r, u, v));
}
void Solve()
{
    memset(st, 3, sizeof st);
    update(1, 1, n * 2, nerf[0], 0);
    int res = 0;
    for(int i=1; i<=n; i++)
    {
        int val = nerf[sum[i].se - x[i]];
        update(1, 1, n * 2, nerf[sum[i - 1].se - x[i]], sum[i - 1].fi);
        res = max(res, sum[i].fi - get(1, 1, n * 2, 0, val));
       // cout << res << " ";
    }
    cout << res;
}
int32_t main()
{
   // freopen("x.inp", "r", stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    ReadInput();
    Solve();
}

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