Submission #1209381

#	Time	Username	Problem	Language	Result	Execution time	Memory
1209381		JooDdae	Examination (JOI19_examination)	C++20	100 / 100	139 ms	11944 KiB

examination

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

const int INF = 1e9;

int n, m, ans[100100], t[400400];

int find(int x) {
    int re = 0;
    while(x) re += t[x], x -= x & -x;
    return re;
}

void solve(vector<array<int, 2>> p, vector<array<int, 4>> q) {
    sort(p.begin(), p.end());
    sort(q.rbegin(), q.rend());

    vector<int> Y;
    for(auto [x, y] : p) Y.push_back(y);
    sort(Y.begin(), Y.end()), Y.erase(unique(Y.begin(), Y.end()), Y.end());
    auto lb = [&](int x) { return lower_bound(Y.begin(), Y.end(), x) - Y.begin() + 1; };
    auto ub = [&](int x) { return upper_bound(Y.begin(), Y.end(), x) - Y.begin() + 1; };
    memset(t, 0, sizeof t);

    for(auto [x, l, r, i] : q) {
        while(!p.empty() && p.back()[0] >= x) {
            auto [x, y] = p.back(); p.pop_back();
            for(int b=lb(y);b<=Y.size();b+=b&-b) t[b]++;
        }
        ans[abs(i)] += (find(ub(r)-1) - find(lb(l)-1)) * (i > 0 ? 1 : -1);
    }
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
	cin >> n >> m;
    vector<array<int, 2>> p(n);
    for(auto &[x, y] : p) cin >> x >> y;
    vector<array<int, 4>> q1, q2;
    for(int i=1;i<=m;i++) {
        int a, b, c; cin >> a >> b >> c;
        if(a+b >= c) q1.push_back({a, b, INF, i});
        else {
            q1.push_back({a, c-a, INF, i});
            q2.push_back({c, 0, c-a-1, i});
            q2.push_back({c, 0, b-1, -i});
        }
    }

    solve(p, q1);
    for(auto &[x, y] : p) x += y;
    solve(p, q2);
    for(int i=1;i<=m;i++) cout << ans[i] << "\n";
}

• Subtask 1: 2 / 2
• Subtask 2: 20 / 20
• Subtask 3: 21 / 21
• Subtask 4: 57 / 57