oj.uz

Submission #636088

# Submission time Handle Problem Language Result Execution time Memory
636088 2022-08-28T02:43:44 Z eecs Autobahn (COI21_autobahn) C++17
100 / 100
 343 ms 32352 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

int main() {
    ios::sync_with_stdio(0), cin.tie(0);
    int n, k, x;
    cin >> n >> k >> x;
    map<int, array<int, 2>> ev;
    for (int i = 0, l, t, r; i < n; i++) {
        cin >> l >> t >> r;
        ev[l][0]++, ev[r + 1][0]--;
        if (l + t <= r) ev[l + t][1]++, ev[r + 1][1]--;
    }
    vector<array<int, 3>> inter;
    int stay = 0, bad = 0, lst = 0;
    for (auto [t, p] : ev) {
        if (stay >= k) inter.push_back({lst, t - 1, bad});
        stay += p[0], bad += p[1], lst = t;
    }
    vector<int> cand;
    for (auto &p : inter) {
        cand.insert(cand.end(), {p[0] - 1, p[0] + x - 1, p[1] - x, p[1]});
    }
    sort(cand.begin(), cand.end());
    cand.resize(unique(cand.begin(), cand.end()) - cand.begin());
    vector<ll> res(cand.size());
    ll overlap = 0;
    for (int i = 0, j = 0; i < cand.size(); i++) {
        for (; j < inter.size() && inter[j][1] < cand[i]; j++) {
            overlap += 1LL * (inter[j][1] - inter[j][0] + 1) * inter[j][2];
        }
        res[i] = overlap;
        if (j < inter.size() && inter[j][0] <= cand[i]) {
            res[i] += 1LL * (cand[i] - inter[j][0] + 1) * inter[j][2];
        }
    }
    ll ans = 0;
    for (auto &p : inter) {
        int it1 = lower_bound(cand.begin(), cand.end(), p[0] - 1) - cand.begin();
        int it2 = lower_bound(cand.begin(), cand.end(), p[0] + x - 1) - cand.begin();
        ans = max(ans, res[it2] - res[it1]);
        it1 = lower_bound(cand.begin(), cand.end(), p[1] - x) - cand.begin();
        it2 = lower_bound(cand.begin(), cand.end(), p[1]) - cand.begin();
        ans = max(ans, res[it2] - res[it1]);
    }
    cout << ans << "\n";
    return 0;
}

Compilation message

autobahn.cpp: In function 'int main()':
autobahn.cpp:30:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |     for (int i = 0, j = 0; i < cand.size(); i++) {
      |                            ~~^~~~~~~~~~~~~
autobahn.cpp:31:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 3> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |         for (; j < inter.size() && inter[j][1] < cand[i]; j++) {
      |                ~~^~~~~~~~~~~~~~
autobahn.cpp:35:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 3> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         if (j < inter.size() && inter[j][0] <= cand[i]) {
      |             ~~^~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 316 KB Output is correct
5 Correct 1 ms 324 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 316 KB Output is correct
11 Correct 1 ms 212 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 316 KB Output is correct
5 Correct 1 ms 324 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 316 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 324 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 316 KB Output is correct
5 Correct 1 ms 324 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 316 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 324 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 323 ms 32292 KB Output is correct
22 Correct 310 ms 32168 KB Output is correct
23 Correct 343 ms 32248 KB Output is correct
24 Correct 306 ms 32352 KB Output is correct
25 Correct 305 ms 32196 KB Output is correct
26 Correct 285 ms 32068 KB Output is correct
27 Correct 306 ms 32188 KB Output is correct
28 Correct 288 ms 32236 KB Output is correct
29 Correct 319 ms 32268 KB Output is correct