oj.uz

Submission #761407

# Submission time Handle Problem Language Result Execution time Memory
761407 2023-06-19T15:22:51 Z MinaRagy06 Sky Walking (IOI19_walk) C++17
10 / 100
 4000 ms 260332 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

vector<int> intersect[100'005];
vector<pair<int, int>> adj[100'005];
vector<ll> dist[100'005];
vector<int> idx[100'005];
const ll INF = 1e18;
ll min_distance(vector<int> x, vector<int> h, vector<int> l, vector<int> r, vector<int> y, int s, int g) {
    auto st = chrono::steady_clock::now().time_since_epoch().count();
    int n = x.size(), m = l.size();
    array<int, 3> skywalks[m];
    for (int i = 0; i < m; i++) {
        skywalks[i] = {y[i], l[i], r[i]};
    }
    sort(skywalks, skywalks + m);
    for (int i = m - 1; i >= 0; i--) {
        y[m - 1 - i] = skywalks[i][0];
        l[m - 1 - i] = skywalks[i][1];
        r[m - 1 - i] = skywalks[i][2];
    }
    array<int, 3> buildings[n];
    for (int i = 0; i < n; i++) {
        buildings[i] = {h[i], x[i], i};
    }
    int actual[n];
    sort(buildings, buildings + n);
    bool oks = 0, okg = 0;
    for (int i = 0; i < n; i++) {
        h[i] = buildings[i][0];
        x[i] = buildings[i][1];
        actual[i] = buildings[i][2];
        if (!oks && s == actual[i]) {
            s = i;
            oks = 1;
        }
        if (!okg && g == actual[i]) {
            g = i;
            okg = 1;
        }
    }
    y.push_back(0);
    idx[s].push_back(m);
    dist[s].push_back(INF);
    int ptr = n - 1;
    set<array<int, 3>> gud;
    for (int i = 0; i < m; i++) {
        while (ptr >= 0 && y[i] <= h[ptr]) {
            gud.insert({actual[ptr], ptr, h[ptr]});
            ptr--;
        }
        auto it = gud.lower_bound({l[i], 0, 0});
        while (it != gud.end() && (*it)[0] <= r[i]) {
            intersect[i].push_back((*it)[1]);
            it++;
        }
        for (int k = 0; k < intersect[i].size(); k++) {
            dist[intersect[i][k]].push_back(INF);
            idx[intersect[i][k]].push_back(i);
        }
        for (int k = 0; k < intersect[i].size(); k++) {
            if (k + 1 < intersect[i].size()) {
                adj[intersect[i][k]].push_back({intersect[i][k + 1], idx[intersect[i][k + 1]].size() - 1});
            }
            if (k - 1 >= 0) {
                adj[intersect[i][k]].push_back({intersect[i][k - 1], idx[intersect[i][k - 1]].size() - 1});
            }
        }
    }
    priority_queue<pair<ll, pair<int, int>>> pq;
    pq.push({0, {s, 0}});
    while (pq.size()) {
        ll d = -pq.top().first;
        int i = pq.top().second.first;
        int j = pq.top().second.second;
        pq.pop();
        if (d > dist[i][j]) continue;
        j = y[idx[i][j]];
        for (auto [nxt, nxth] : adj[i]) {
            ll newd = d + abs(x[nxt] - x[i]) + abs(j - y[idx[nxt][nxth]]);
            if (newd < dist[nxt][nxth]) {
                dist[nxt][nxth] = newd;
                pq.push({-newd, {nxt, nxth}});
            }
        }
    }
    // cout << s << ' ' << g << '\n';
    ll ans = INF;
    for (int i = 0; i < dist[g].size(); i++) {
        ans = min(ans, dist[g][i] + y[idx[g][i]]);
    }
    // auto en = chrono::steady_clock::now().time_since_epoch().count();
    // cout << (en - st) / 1e9 << '\n';
    if (ans >= INF) return -1;
    return ans;
}
//int main() {
//    ios_base::sync_with_stdio(0), cin.tie(0);
//    int N, M;
//    cin >> N >> M;
//    vector<int> X(N), H(N);
//    for (int i = 0; i < N; i++) {
//        cin >> X[i] >> H[i];
//    }
//    vector<int> L(M), R(M), Y(M);
//    for (int i = 0; i < M; i++) {
//        cin >> L[i] >> R[i] >> Y[i];
//    }
//    int S, G;
//    cin >> S >> G;
//    cout << min_distance(X, H, L, R, Y, S, G) << '\n';
//    return 0;
//}

Compilation message

walk.cpp: In function 'll min_distance(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, int, int)':
walk.cpp:58:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |         for (int k = 0; k < intersect[i].size(); k++) {
      |                         ~~^~~~~~~~~~~~~~~~~~~~~
walk.cpp:62:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |         for (int k = 0; k < intersect[i].size(); k++) {
      |                         ~~^~~~~~~~~~~~~~~~~~~~~
walk.cpp:63:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |             if (k + 1 < intersect[i].size()) {
      |                 ~~~~~~^~~~~~~~~~~~~~~~~~~~~
walk.cpp:90:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   90 |     for (int i = 0; i < dist[g].size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~~
walk.cpp:11:10: warning: unused variable 'st' [-Wunused-variable]
   11 |     auto st = chrono::steady_clock::now().time_since_epoch().count();
      |          ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 9684 KB Output is correct
2 Correct 5 ms 9684 KB Output is correct
3 Correct 4 ms 9676 KB Output is correct
4 Correct 5 ms 9632 KB Output is correct
5 Correct 5 ms 9684 KB Output is correct
6 Correct 5 ms 9684 KB Output is correct
7 Correct 5 ms 9684 KB Output is correct
8 Correct 5 ms 9684 KB Output is correct
9 Correct 4 ms 9684 KB Output is correct
10 Correct 6 ms 9812 KB Output is correct
11 Correct 4 ms 9684 KB Output is correct
12 Correct 5 ms 9688 KB Output is correct
13 Correct 4 ms 9684 KB Output is correct
14 Correct 5 ms 9684 KB Output is correct
15 Correct 5 ms 9684 KB Output is correct
16 Correct 4 ms 9684 KB Output is correct
17 Correct 5 ms 9684 KB Output is correct

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 9684 KB Output is correct
2 Correct 4 ms 9684 KB Output is correct
3 Correct 1625 ms 55600 KB Output is correct
4 Correct 630 ms 55924 KB Output is correct
5 Correct 305 ms 51796 KB Output is correct
6 Correct 256 ms 48540 KB Output is correct
7 Correct 313 ms 51900 KB Output is correct
8 Correct 3205 ms 87540 KB Output is correct
9 Correct 399 ms 49896 KB Output is correct
10 Correct 970 ms 72688 KB Output is correct
11 Correct 266 ms 33432 KB Output is correct
12 Correct 253 ms 35064 KB Output is correct
13 Correct 811 ms 70756 KB Output is correct
14 Correct 171 ms 34832 KB Output is correct
15 Correct 150 ms 35052 KB Output is correct
16 Correct 320 ms 34452 KB Output is correct
17 Correct 135 ms 33704 KB Output is correct
18 Execution timed out 4066 ms 27584 KB Time limit exceeded
19 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 17844 KB Output is correct
2 Execution timed out 4038 ms 260332 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 17844 KB Output is correct
2 Execution timed out 4038 ms 260332 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #5
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 9684 KB Output is correct
2 Correct 5 ms 9684 KB Output is correct
3 Correct 4 ms 9676 KB Output is correct
4 Correct 5 ms 9632 KB Output is correct
5 Correct 5 ms 9684 KB Output is correct
6 Correct 5 ms 9684 KB Output is correct
7 Correct 5 ms 9684 KB Output is correct
8 Correct 5 ms 9684 KB Output is correct
9 Correct 4 ms 9684 KB Output is correct
10 Correct 6 ms 9812 KB Output is correct
11 Correct 4 ms 9684 KB Output is correct
12 Correct 5 ms 9688 KB Output is correct
13 Correct 4 ms 9684 KB Output is correct
14 Correct 5 ms 9684 KB Output is correct
15 Correct 5 ms 9684 KB Output is correct
16 Correct 4 ms 9684 KB Output is correct
17 Correct 5 ms 9684 KB Output is correct
18 Correct 4 ms 9684 KB Output is correct
19 Correct 4 ms 9684 KB Output is correct
20 Correct 1625 ms 55600 KB Output is correct
21 Correct 630 ms 55924 KB Output is correct
22 Correct 305 ms 51796 KB Output is correct
23 Correct 256 ms 48540 KB Output is correct
24 Correct 313 ms 51900 KB Output is correct
25 Correct 3205 ms 87540 KB Output is correct
26 Correct 399 ms 49896 KB Output is correct
27 Correct 970 ms 72688 KB Output is correct
28 Correct 266 ms 33432 KB Output is correct
29 Correct 253 ms 35064 KB Output is correct
30 Correct 811 ms 70756 KB Output is correct
31 Correct 171 ms 34832 KB Output is correct
32 Correct 150 ms 35052 KB Output is correct
33 Correct 320 ms 34452 KB Output is correct
34 Correct 135 ms 33704 KB Output is correct
35 Execution timed out 4066 ms 27584 KB Time limit exceeded
36 Halted 0 ms 0 KB -