oj.uz

Submission #920710

# Submission time Handle Problem Language Result Execution time Memory
920710 2024-02-03T00:34:32 Z zeta7532 Autobahn (COI21_autobahn) C++17
0 / 100
 0 ms 344 KB 
#include <bits/stdc++.h>
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using namespace std;
#define faster ios::sync_with_stdio(false);cin.tie(nullptr)
 
int main() {
    faster;
    int N, K;
    long long 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]++; }
    /* 座標圧縮用の座標 */
    vector P(0, 0);
    for(int i = 0; i < N; i++) { P.push_back(l[i]), P.push_back(r[i]); } /* 各区間の始点終点 */
    for(int i = 0; i < N; i++) { if(l[i]+t[i] < r[i]) { P.push_back(l[i]+t[i]); } } /* 追加料金のかかる区間の始点 */
    unordered_map<int, int> mp2;
    for(int i = 0; i < (int)size(P); i++) { mp2[P[i]] = 1; }
    int sizep(size(P));
    for(int i = 0; i < sizep; i++) { 
        if(P[i]<P[sizep-1]-X) P.push_back(P[i]+X);
        if(P[i]>P[0]+X) P.push_back(P[i]-X); 
    } /* ある点から X の距離の点 */
    sort(begin(P), end(P));
    P.erase(unique(begin(P), end(P)), end(P));
 
    /* P の逆引きできるような連想配列 */
    unordered_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]]]--; } /* 各区間の区間加算 */
    for(int i = 0; i+1 < (int)size(P); i++) { imos[i+1] += imos[i]; } /* 求解 */
 
    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]]]--; } } /* 追加料金の区間加算 */
    for(int i = 0; i+1 < (int)size(P); i++) { imos2[i+1] += imos2[i]; } /* 求解 */
    for(int i = 0; i < (int)size(P); i++) { if(imos[i] < K) { imos2[i] = 0; } } /* 許される場合は除外する */
 
    /* 尺取り法 */
    long long ans(0LL), res(0LL);
    for(int i = 0, j = 0; i+1 < (int)size(P); i++) {
        if((!mp2[P[i]])&&(!mp2[P[i]+X])){
            res -= imos2[mp[P[i]]] * (long long)(P[i+1] - P[i]);
            continue;
        } 
        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]]] * (long long)(P[j+1]-P[j]); } /* 右端を加算 */
        }
        ans = max(res, ans);
        res -= imos2[mp[P[i]]] * (long long)(P[i+1] - P[i]); /* 左端を加算 */
    }
    cout << ans << '\n';
    return 0;
}

Subtask #1
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 0 ms 344 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 0 ms 344 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 0 ms 344 KB Output isn't correct
3 Halted 0 ms 0 KB -