제출 #589961

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
589961		piOOE	The Potion of Great Power (CEOI20_potion)	C++17	38 / 100	3049 ms	50508 KiB

potion

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

const int maxN = 100000, maxU = 200000, INF = 1000000000, BL = 300;
int a[maxU], b[maxU], h[maxN], n, u, d;

struct comp {
    bool operator()(int i, int j) const {
        return h[i] == h[j] ? i < j : h[i] < h[j];
    }
};

template<typename T>
using uset = set<T, comp>;

vector<uset<int>> g[maxN];

uset<int> temp[maxN];

vector<int> ti[maxN];
vector<pair<int, int>> c[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]});
            c[a[i]].emplace_back(~b[i], i + 1);
            c[b[i]].emplace_back(~a[i], i + 1);
            temp[a[i]].erase(b[i]);
            temp[b[i]].erase(a[i]);
        } else {
            adj.insert({a[i], b[i]});
            c[a[i]].emplace_back(b[i], i + 1);
            c[b[i]].emplace_back(a[i], i + 1);
            temp[a[i]].insert(b[i]);
            temp[b[i]].insert(a[i]);
        }
        if (c[a[i]].size() % BL == 0) {
            g[a[i]].push_back(temp[a[i]]);
            ti[a[i]].push_back(i + 1);
        }

        if (c[b[i]].size() % BL == 0) {
            g[b[i]].push_back(temp[b[i]]);
            ti[b[i]].push_back(i + 1);
        }
    }
}

vector<int> get(int x, int v) {
    int it = upper_bound(ti[x].begin(), ti[x].end(), v) - ti[x].begin() - 1, t = 0;
    uset<int> ans;
    if (it > -1) {
        ans = g[x][it];
        t = ti[x][it] + 1;
    }
    it = lower_bound(c[x].begin(), c[x].end(), make_pair(-1, t), [](pair<int, int> a, pair<int, int> b) {
        return a.second < b.second;
    }) - c[x].begin();
    int cnt = 0;
    for (; it < int(c[x].size()) && c[x][it].second <= v; ++it) {
        auto [y, tt] = c[x][it];
        if (y < 0) {
            ans.erase(~y);
        } else {
            ans.insert(y);
        }
        cnt += 1;
    }
    assert(cnt <= BL);
    vector<int> answer(ans.begin(), ans.end());
    return answer;
}

int question(int x, int y, int v) {
    int ans = INF;
    vector<int> f = get(x, v), s = get(y, v);
    int pnt = 0;
    for (int to: f) {
        while (pnt < s.size() && h[s[pnt]] < h[to]) {
            pnt += 1;
        }
        if (pnt != s.size()) {
            ans = min(ans, h[s[pnt]] - h[to]);
        }
        if (pnt > 0) {
            ans = min(ans, h[to] - h[s[pnt - 1]]);
        }
    }
    return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

potion.cpp: In function 'int question(int, int, int)':
potion.cpp:94:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |         while (pnt < s.size() && h[s[pnt]] < h[to]) {
      |                ~~~~^~~~~~~~~~
potion.cpp:97:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   97 |         if (pnt != s.size()) {
      |             ~~~~^~~~~~~~~~~

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