oj.uz

Submission #418128

# Submission time Handle Problem Language Result Execution time Memory
418128 2021-06-05T06:37:49 Z usachevd0 Sky Walking (IOI19_walk) C++17
24 / 100
 3284 ms 840888 KB 
#include <bits/stdc++.h>
#ifndef LOCAL
    #include "walk.h"
#endif

using namespace std;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define Time (clock() * 1.0 / CLOCKS_PER_SEC)
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
using ld = long double;
template<typename T1, typename T2> bool chkmin(T1& x, T2 y) {
    return y < x ? (x = y, true) : false;
}
template<typename T1, typename T2> bool chkmax(T1& x, T2 y) {
    return y > x ? (x = y, true) : false;
}
void debug_out() {
    cerr << endl;
}
template<typename T1, typename... T2> void debug_out(T1 A, T2... B) {
    cerr << ' ' << A;
    debug_out(B...);
}
template<typename T> void mdebug_out(T* a, int n) {
    for (int i = 0; i < n; ++i)
        cerr << a[i] << ' ';
    cerr << endl;
}
#ifdef LOCAL
    #define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
    #define mdebug(a, n) cerr << #a << ": ", mdebug_out(a, n)
#else
    #define debug(...) 1337
    #define mdebug(a, n) 1337
#endif
template<typename T> ostream& operator << (ostream& stream, const vector<T>& v) {
    for (auto& x : v)
        stream << x << ' ';
    return stream;
}
template<typename T1, typename T2> ostream& operator << (ostream& stream, const pair<T1, T2>& p) {
    return stream << p.first << ' ' << p.second;
}

const ll INF64 = 1e18;
const int maxN = 100005;
int n, m;

const int maxV = 4e6 + 6;
int V;
vector<pii> G[maxV];
ll dist[maxV];
priority_queue<pli> pq;

map<int, int> ptIdx[maxN];
int getIdx(int x, int y) {
    if (ptIdx[x].count(y))
        return ptIdx[x][y];
    // debug(x, y, V);
    return ptIdx[x][y] = V++;
}

void addEdge(int u, int v, int w) {
    // debug(u, v, w);
    G[u].emplace_back(v, w);
    G[v].emplace_back(u, w);
}

ll min_distance(vector<int> X, vector<int> H, vector<int> L, vector<int> R, vector<int> Y, int SI, int TI) {
    n = X.size(), m = L.size();
    
    int S, T;
    for (int i = 0; i < n; ++i) {
        int v = getIdx(i, 0);
        if (i == SI)
            S = v;
        if (i == TI)
            T = v;
    }
    // debug(S, T);
    vector<int> ordy(m);
    iota(all(ordy), 0);
    sort(all(ordy), [&](int j1, int j2) -> bool {
        return Y[j1] > Y[j2];
    });
    vector<int> ordh(n);
    iota(all(ordh), 0);
    sort(all(ordh), [&](int i1, int i2) -> bool {
        return H[i1] > H[i2];
    });
    set<int> active;
    int hptr = 0;
    for (int j : ordy) {
        int l = L[j], r = R[j], y = Y[j];
        
        for (; hptr < ordh.size(); ++hptr) {
            int i = ordh[hptr];
            if (H[i] >= y)
                active.insert(i);
            else
                break;
        }
        
        int last_i = l, last_v = getIdx(l, y);
        for (auto it = active.upper_bound(l); it != active.end() && (*it) <= r; it = next(it)) {
            int i = *it;
            int v = getIdx(i, y);
            addEdge(last_v, v, X[i] - X[last_i]);
            last_v = v;
            last_i = i;
        }
        // for (int i = l + 1; i <= r; ++i) {
        //     if (H[i] >= y) {
        //         int v = getIdx(i, y);
        //         addEdge(last_v, v, X[i] - X[last_i]);
        //         last_v = v;
        //         last_i = i;
        //     }
        // }
    }
    for (int i = 0; i < n; ++i) {
        int last_y = -1, last_v = -1;
        for (auto& [y, v] : ptIdx[i]) {
            if (last_y != -1) {
                addEdge(last_v, v, y - last_y);
            }
            last_y = y;
            last_v = v;
        }
    }
    
    fill(dist, dist + V, INF64);
    dist[S] = 0;
    pq.push({0, S});
    while (!pq.empty()) {
        ll _d = -pq.top().fi;
        int v = pq.top().se;
        pq.pop();
        if (_d != dist[v]) continue;
        // debug(v, dist[v]);
        if (v == T) return dist[v];
        for (auto& [u, w] : G[v])
            if (chkmin(dist[u], dist[v] + w))
                pq.push({-dist[u], u});
    }
    return -1;
}


#ifdef LOCAL

int32_t main() {
#ifdef LOCAL
    freopen("in", "r", stdin);
#endif
    ios::sync_with_stdio(0);
    cin.tie(0);
    
        int n, m;
    assert(2 == scanf("%d%d", &n, &m));
    vector<int> x(n), h(n);
    for (int i = 0; i < n; i++)
        assert(2 == scanf("%d%d", &x[i], &h[i]));
    vector<int> l(m), r(m), y(m);
    for (int i = 0; i < m; i++)
        assert(3 == scanf("%d%d%d", &l[i], &r[i], &y[i]));
    int s, g;
    assert(2 == scanf("%d%d", &s, &g));
    fclose(stdin);

    long long result = min_distance(x, h, l, r, y, s, g);

    printf("%lld\n", result);
    fclose(stdout);
    
    return 0;
}

#endif

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:106:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  106 |         for (; hptr < ordh.size(); ++hptr) {
      |                ~~~~~^~~~~~~~~~~~~
walk.cpp:151:9: warning: 'T' may be used uninitialized in this function [-Wmaybe-uninitialized]
  151 |         if (v == T) return dist[v];
      |         ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 54 ms 98876 KB Output is correct
2 Correct 52 ms 98912 KB Output is correct
3 Correct 52 ms 98876 KB Output is correct
4 Correct 53 ms 98880 KB Output is correct
5 Correct 53 ms 98884 KB Output is correct
6 Correct 53 ms 98928 KB Output is correct
7 Correct 56 ms 99068 KB Output is correct
8 Correct 54 ms 98884 KB Output is correct
9 Correct 53 ms 98924 KB Output is correct
10 Correct 52 ms 98964 KB Output is correct
11 Correct 52 ms 98936 KB Output is correct
12 Correct 53 ms 98884 KB Output is correct
13 Correct 55 ms 98912 KB Output is correct
14 Correct 54 ms 98864 KB Output is correct
15 Correct 54 ms 98812 KB Output is correct
16 Correct 54 ms 98884 KB Output is correct
17 Correct 53 ms 99012 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 98880 KB Output is correct
2 Correct 53 ms 98916 KB Output is correct
3 Correct 895 ms 191868 KB Output is correct
4 Correct 950 ms 204484 KB Output is correct
5 Correct 623 ms 190868 KB Output is correct
6 Correct 568 ms 180352 KB Output is correct
7 Correct 662 ms 190916 KB Output is correct
8 Correct 1235 ms 218640 KB Output is correct
9 Correct 792 ms 188612 KB Output is correct
10 Correct 1322 ms 244648 KB Output is correct
11 Correct 524 ms 149752 KB Output is correct
12 Correct 416 ms 135884 KB Output is correct
13 Correct 1131 ms 226864 KB Output is correct
14 Correct 302 ms 134464 KB Output is correct
15 Correct 361 ms 135904 KB Output is correct
16 Correct 326 ms 136996 KB Output is correct
17 Correct 333 ms 135220 KB Output is correct
18 Correct 274 ms 133432 KB Output is correct
19 Correct 63 ms 100724 KB Output is correct
20 Correct 151 ms 118468 KB Output is correct
21 Correct 333 ms 136768 KB Output is correct
22 Correct 304 ms 138820 KB Output is correct
23 Correct 352 ms 147408 KB Output is correct
24 Correct 320 ms 138776 KB Output is correct
25 Correct 344 ms 137340 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 124 ms 108824 KB Output is correct
2 Runtime error 3284 ms 840888 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 124 ms 108824 KB Output is correct
2 Runtime error 3284 ms 840888 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #5
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 54 ms 98876 KB Output is correct
2 Correct 52 ms 98912 KB Output is correct
3 Correct 52 ms 98876 KB Output is correct
4 Correct 53 ms 98880 KB Output is correct
5 Correct 53 ms 98884 KB Output is correct
6 Correct 53 ms 98928 KB Output is correct
7 Correct 56 ms 99068 KB Output is correct
8 Correct 54 ms 98884 KB Output is correct
9 Correct 53 ms 98924 KB Output is correct
10 Correct 52 ms 98964 KB Output is correct
11 Correct 52 ms 98936 KB Output is correct
12 Correct 53 ms 98884 KB Output is correct
13 Correct 55 ms 98912 KB Output is correct
14 Correct 54 ms 98864 KB Output is correct
15 Correct 54 ms 98812 KB Output is correct
16 Correct 54 ms 98884 KB Output is correct
17 Correct 53 ms 99012 KB Output is correct
18 Correct 52 ms 98880 KB Output is correct
19 Correct 53 ms 98916 KB Output is correct
20 Correct 895 ms 191868 KB Output is correct
21 Correct 950 ms 204484 KB Output is correct
22 Correct 623 ms 190868 KB Output is correct
23 Correct 568 ms 180352 KB Output is correct
24 Correct 662 ms 190916 KB Output is correct
25 Correct 1235 ms 218640 KB Output is correct
26 Correct 792 ms 188612 KB Output is correct
27 Correct 1322 ms 244648 KB Output is correct
28 Correct 524 ms 149752 KB Output is correct
29 Correct 416 ms 135884 KB Output is correct
30 Correct 1131 ms 226864 KB Output is correct
31 Correct 302 ms 134464 KB Output is correct
32 Correct 361 ms 135904 KB Output is correct
33 Correct 326 ms 136996 KB Output is correct
34 Correct 333 ms 135220 KB Output is correct
35 Correct 274 ms 133432 KB Output is correct
36 Correct 63 ms 100724 KB Output is correct
37 Correct 151 ms 118468 KB Output is correct
38 Correct 333 ms 136768 KB Output is correct
39 Correct 304 ms 138820 KB Output is correct
40 Correct 352 ms 147408 KB Output is correct
41 Correct 320 ms 138776 KB Output is correct
42 Correct 344 ms 137340 KB Output is correct
43 Correct 124 ms 108824 KB Output is correct
44 Runtime error 3284 ms 840888 KB Execution killed with signal 11
45 Halted 0 ms 0 KB -