Submission #589814

#	Time	Username	Problem	Language	Result	Execution time	Memory
589814		piOOE	The Potion of Great Power (CEOI20_potion)	C++17	14 / 100	786 ms	40284 KiB

potion

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

const int maxN = 100000, maxU = 200000, INF = 1000000000;

int a[maxU], b[maxU], h[maxN], n, u, d;

vector<int> g[maxN];

void init(int N, int D, int H[]) {
    n = N, d = D;
    memcpy(h, H, sizeof(h[0]) * n);
}

void curseChanges(int U, int A[], int B[]) {
    u = U;
    memcpy(a, A, sizeof(a[0]) * u), memcpy(b, B, sizeof(b[0]) * u);
    set<pair<int, int>> adj;
    for (int i = 0; i < u; ++i) {
        if (a[i] > b[i]) {
            swap(a[i], b[i]);
        }
        if (adj.count({a[i], b[i]})) {
            adj.erase({a[i], b[i]});
        } else {
            adj.insert({a[i], b[i]});
        }
    }
    for (auto [x, y]: adj) {
        g[x].push_back(y);
        g[y].push_back(x);
    }
    for (int i = 0; i < n; ++i) {
        sort(g[i].begin(), g[i].end(), [](int i, int j) {
            return h[i] < h[j];
        });
    }
}

int question(int x, int y, int v) {
    //i suppose that v == u
    assert(v == u);
    int ans = INF;
    for (int to : g[x]) {
        auto it = lower_bound(g[y].begin(), g[y].end(), to, [](int i, int j) {
            return h[i] < h[j];
        });
        if (it != g[y].end()) {
            ans = min(ans, h[*it] - h[to]);
        }
        if (it != g[y].begin()) {
            ans = min(ans, h[to] - h[*prev(it)]);
        }
    }
    return ans;
}

• Subtask 1: 0 / 0
• Subtask 2: 0 / 17
• Subtask 3: 14 / 14
• Subtask 4: 0 / 18
• Subtask 5: 0 / 21
• Subtask 6: 0 / 30