제출 #920416

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
920416		hasuhasuiro	Autobahn (COI21_autobahn)	C++17	0 / 100	1 ms	348 KiB

autobahn

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

int main() {
    int N, K, X;
    cin >> N >> K >> X;
    vector l(N, 0), r(N, 0), t(N, 0);
    for(int i = 0; i < N; i++) { cin >> l[i] >> t[i] >> r[i]; r[i]++; }
    vector P(0, 0);
    for(int i = 0; i < N; i++) { P.push_back(l[i]), P.push_back(r[i]); }
    for(int i = 0; i < N; i++) { if(l[i]+t[i] < r[i]) { P.push_back(l[i]+t[i]); } }
    int sizep(size(P));
    for(int i = 0; i < sizep; i++) { P.push_back(P[i]+X), P.push_back(P[i]-X); }
    sort(begin(P), end(P));
    P.erase(unique(begin(P), end(P)), end(P));

    map<int, int> mp;
    for(int i = 0; i < (int)size(P); i++) { mp[P[i]] = i; }
    vector imos(size(P), 0);
    for(int i = 0; i < N; i++) { imos[mp[l[i]]]++; imos[mp[r[i]]]--; }
    for(int i = 0; i+1 < (int)size(P); i++) { imos[i+1] += imos[i]; }

    vector imos2(size(P), 0);
    for(int i = 0; i < N; i++) { if(l[i]+t[i] < r[i]) { imos2[mp[l[i]+t[i]]]++; imos2[mp[r[i]]]--; } }
    for(int i = 0; i+1 < (int)size(P); i++) { imos2[i+1] += imos2[i]; }
    for(int i = 0; i < (int)size(P); i++) { if(imos[i] < K) { imos2[i] = 0; } }

    int ans(0), res(0);
    for(int i = 0, j = 0; i+1 < (int)size(P); i++) {
        for(; j < (int)size(P); j++) {
            if(P[i]+X <= P[j]) { break; }
            else if(j+1 < (int)size(P)) { res += imos2[mp[P[j]]] * (P[j+1]-P[j]); }
        }
        ans = max(res, ans);
        res -= imos2[mp[P[i]]] * (P[i+1] - P[i]);
    }
    cout << ans << endl;
    return 0;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50