Submission #435895

#	Time	Username	Problem	Language	Result	Execution time	Memory
435895		illyakr	Distributing Candies (IOI21_candies)	C++17	40 / 100	879 ms	24752 KiB

candies

#include <bits/stdc++.h>
#include "candies.h"
using namespace std;
#define ll long long

vector<int> res;
int n, q;
bool scbl = true;
ll _res[201010];
ll t[801010];
ll tAdd[801010];
ll tPress[801010];
pair<ll, ll> Up[201010];
void push(int v, int vl, int vr) {
    if (tPress[v] == -1 && tAdd[v] == 0)return;
    if (vl == vr) {
        if (tPress[v] != -1){t[v] = tPress[v];t[v] = min(t[v], Up[vl].first);}
        if (tAdd[v] != 0)t[v] += tAdd[v];
        if (t[v] < 0 || t[v] > Up[vl].first) {
            exit(1);
        }
    } else {
        if (tPress[v] != -1) {
            tAdd[2 * v] = tAdd[v];
            tPress[2 * v] = tPress[v];

            tAdd[2 * v + 1] = tAdd[v];
            tPress[2 * v + 1] = tPress[v];
        } else if (tAdd[v] != 0) {
            tAdd[2 * v] += tAdd[v];
            tAdd[2 * v + 1] += tAdd[v];
        }
    }
    tPress[v] = -1; tAdd[v] = 0;
}
void updAdd(int v, int vl, int vr, int l, int r, ll val) {
    push(v, vl, vr);
    if (l <= vl && vr <= r) {
        tAdd[v] += val;
        push(v, vl, vr);
        return;
    }
    if (r < vl || vr < l)return;
    int vm = (vl + vr) / 2;
    updAdd(2 * v, vl, vm, l, r, val);
    updAdd(2 * v + 1, vm + 1, vr, l, r, val);
}
void updPress(int v, int vl, int vr, int l, int r, int val) {
    push(v, vl, vr);
    if (l <= vl && vr <= r) {
        tPress[v] = val;
        push(v, vl, vr);
        return;
    }
    if (r < vl || vr < l)return;
    int vm = (vl + vr) / 2;
    updPress(2 * v, vl, vm, l, r, val);
    updPress(2 * v + 1, vm + 1, vr, l, r, val);
}
int gt(int v, int vl, int vr, int pos) {
    push(v, vl, vr);
    if (vl == vr)return t[v];
    int vm = (vl + vr) / 2;
    if (pos <= vm)return gt(2 * v, vl, vm, pos);
    return gt(2 * v + 1, vm + 1, vr, pos);
}

std::vector<int> distribute_candies(std::vector<int> c, std::vector<int> l,
                                    std::vector<int> r, std::vector<int> v) {
    n = c.size(); q = v.size();
    res.resize(n, 0);
    for (int i = 0; i < q; i++)
        if (v[i] < 0){scbl = false;break;}

    if (n * q <= 100000000) {
        for (int i = 0; i < q; i++) {
            for (int j = l[i]; j <= r[i]; j++) {
                res[j] += v[i];
                if (res[j] < 0)res[j] = 0;
                else if (res[j] > c[j])res[j] = c[j];
            }
        }
        return res;
    }
    if (scbl) {
        for (int i = 0; i < q; i++) {
            _res[l[i]] += v[i];
            _res[r[i] + 1] -= v[i];
        }
        for (int i = 1; i < n; i++)
            _res[i] += _res[i - 1];
        for (int i = 0; i < n; i++) {
            _res[i] = min(_res[i], (ll)c[i]);
            res[i] = _res[i];
        }
        return res;
    }

    for (int i = 0; i < n; i++)
        Up[i] = {c[i], i};
    sort(Up, Up + n, [](pair<ll, ll> q, pair<ll, ll> w) {
         return q.first < w.first;
    });
    memset(tPress, -1, sizeof(tPress));
//    for (int i = 0; i < n; i++) {
//        cout << Up[i].first << " " << Up[i].second << endl;
//    }

    for (int id = 0; id < q; id++) {
        int AllLeft = -1;
        {
            int l = -1, r = n;
            while (l + 1 < r) {
                int mid = (l + r) / 2;
                int el = gt(1, 0, n - 1, mid);
                if (v[id] < 0) {
                    if (el + v[id] <= 0)l = mid;
                    else r = mid;
                } else {
                    if (el + v[id] >= Up[mid].first)l = mid;
                    else r = mid;
                }
            }
            AllLeft = l;
        }
        if (v[id] < 0) {
            if (AllLeft != -1)updPress(1, 0, n - 1, 0, AllLeft, 0);
            if (AllLeft != n - 1)updAdd(1, 0, n - 1, AllLeft + 1, n - 1, v[id]);
        } else {
            if (AllLeft != -1)updPress(1, 0, n - 1, 0, AllLeft, 1101010101010101010);
            if (AllLeft != n - 1)updAdd(1, 0, n - 1, AllLeft + 1, n - 1, v[id]);
        }
    }
    for (int i = 0; i < n; i++)
        res[Up[i].second] = gt(1, 0, n - 1, i);
    return res;
}

/**
5
8 9 3 5 10
3
0 5 3
0 5 5
0 5 -4

8 8 3 5 8





3
10 15 13
2
0 2 20
0 1 -11


0 4 13
*/

Compilation message (stderr)

candies.cpp: In function 'std::vector<int> distribute_candies(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
candies.cpp:130:65: warning: overflow in conversion from 'long int' to 'int' changes value from '1101010101010101010' to '2094199570' [-Woverflow]
  130 |             if (AllLeft != -1)updPress(1, 0, n - 1, 0, AllLeft, 1101010101010101010);
      |                                                                 ^~~~~~~~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 8 / 8
• Subtask 3: 0 / 27
• Subtask 4: 29 / 29
• Subtask 5: 0 / 33