oj.uz

Submission #805158

# Submission time Handle Problem Language Result Execution time Memory
805158 2023-08-03T13:31:52 Z becaido Stations (IOI20_stations) C++17
100 / 100
 802 ms 768 KB 
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,popcnt,sse4,abm")
#include <bits/stdc++.h>
using namespace std;

#ifndef WAIMAI
#include "stations.h"
#endif

#ifdef WAIMAI
#define debug(HEHE...) cout << "[" << #HEHE << "] : ", dout(HEHE)
void dout() {cout << '\n';}
template<typename T, typename...U>
void dout(T t, U...u) {cout << t << (sizeof...(u) ? ", " : ""), dout(u...);}
#else
#define debug(...) 7122
#endif

#define ll long long
#define Waimai ios::sync_with_stdio(false), cin.tie(0)
#define FOR(x,a,b) for (int x = a, I = b; x <= I; x++)
#define pb emplace_back
#define F first
#define S second

const int SIZE = 1005;

vector<int> adj[SIZE];
int id[SIZE];
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    vector<int> labels(n, -1);
    FOR (i, 0, n - 1) {
        adj[i].clear();
        id[i] = -1;
    }
    FOR (i, 0, n - 2) {
        adj[u[i]].pb(v[i]);
        adj[v[i]].pb(u[i]);
    }
    int dfsid = 0;
    auto dfs = [&](auto dfs, int pos, int fa, bool f)->void {
        if (f) id[pos] = dfsid++;
        for (int np : adj[pos]) if (np != fa) {
            dfs(dfs, np, pos, !f);
        }
        if (!f) id[pos] = dfsid++;
    };
    dfs(dfs, 0, 0, 1);
    FOR (i, 0, n - 1) labels[i] = id[i];
    return labels;
}

int find_next_station(int s, int t, vector<int> c) {
    sort(c.begin(), c.end());
    if (s == 0) {
        for (int x : c) if (t <= x) return x;
    }
    if (s < c[0]) {
        int l = s;
        for (int i = 0; i + 1 < c.size(); i++) {
            if (l <= t && t <= c[i]) return c[i];
            l = c[i] + 1;
        }
        return c.back();
    }
    int r = s;
    for (int i = c.size() - 1; i >= 1; i--) {
        if (c[i] <= t && t <= r) return c[i];
        r = c[i] - 1;
    }
    return c[0];
}

/*
in1
1
5 10000000
0 1
1 2
1 3
2 4
2
2 0 1
1 3 3
out1
9
1
3

case1
1
5 1000000
4 2
2 3
3 0
0 1
2
2 1 3
1 4 0

case2
1
7 100000
0 1
0 2
1 3
1 4
2 5
2 6
3
4 5 1
6 0 2
1 4 4

case3
1
6 1000000
1 4
4 3
3 5
4 2
2 0
5
1 4 4
4 5 3
0 2 2
2 0 0
3 2 4
*/

#ifdef WAIMAI
static int max_label = 0;
static int r, n, k, q;
static vector<int> u, v, labels, answers;
static map<int, int> reverse_labels;
static vector<vector<int>> adjlist;
static int s, t, w;
static vector<int> c;

int main() {
    assert(scanf("%d", &r) == 1);
    for (int tc = 0; tc < r; tc++) {
        assert(scanf("%d%d", &n, &k) == 2);
        u.resize(n - 1);
        v.resize(n - 1);
        adjlist.clear();
        adjlist.resize(n);
        for (int i = 0; i < n - 1; i++) {
            assert(scanf("%d%d", &u[i], &v[i]) == 2);
            adjlist[u[i]].push_back(v[i]);
            adjlist[v[i]].push_back(u[i]);
        }
        labels = label(n, k, u, v);
        if ((int)labels.size() != n) {
            printf("Number of labels not equal to %d\n", n);
            exit(0);
        }
        reverse_labels.clear();
        for (int i = 0; i < n; i++) {
            if (labels[i] < 0 || labels[i] > k) {
                printf("Label not in range 0 to %d\n", k);
                exit(0);
            }
            if (reverse_labels.find(labels[i]) != reverse_labels.end()) {
                printf("Labels not unique\n");
                exit(0);
            }
            reverse_labels[labels[i]] = i;
            if (labels[i] > max_label) {
                max_label = labels[i];
            }
        }
        assert(scanf("%d", &q) == 1);
        for (int i = 0; i < q; i++) {
            assert(scanf("%d%d%d", &s, &t, &w) == 3);
            c.clear();
            for (int v : adjlist[s]) {
                c.push_back(labels[v]);
            }
            sort(c.begin(), c.end());
            int answer = find_next_station(labels[s], labels[t], c);
            if (!binary_search(c.begin(), c.end(), answer)) {
                printf("Label %d returned by find_next_station not found in c\n", answer);
                exit(0);
            }
            answers.push_back(reverse_labels[answer]);
        }
    }
    printf("%d\n", max_label);
    for (int index : answers) {
        printf("%d\n", index);
    }
    exit(0);
}
#endif

Compilation message

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:60:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |         for (int i = 0; i + 1 < c.size(); i++) {
      |                         ~~~~~~^~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 472 ms 528 KB Output is correct
2 Correct 324 ms 532 KB Output is correct
3 Correct 639 ms 544 KB Output is correct
4 Correct 514 ms 532 KB Output is correct
5 Correct 442 ms 536 KB Output is correct
6 Correct 356 ms 608 KB Output is correct
7 Correct 283 ms 532 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 4 ms 556 KB Output is correct
10 Correct 0 ms 488 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 402 ms 596 KB Output is correct
2 Correct 525 ms 532 KB Output is correct
3 Correct 707 ms 524 KB Output is correct
4 Correct 476 ms 536 KB Output is correct
5 Correct 522 ms 416 KB Output is correct
6 Correct 349 ms 536 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 419 ms 536 KB Output is correct
2 Correct 275 ms 604 KB Output is correct
3 Correct 802 ms 416 KB Output is correct
4 Correct 575 ms 416 KB Output is correct
5 Correct 498 ms 532 KB Output is correct
6 Correct 298 ms 532 KB Output is correct
7 Correct 408 ms 528 KB Output is correct
8 Correct 1 ms 620 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 0 ms 492 KB Output is correct
11 Correct 523 ms 536 KB Output is correct
12 Correct 437 ms 704 KB Output is correct
13 Correct 363 ms 656 KB Output is correct
14 Correct 336 ms 524 KB Output is correct
15 Correct 38 ms 544 KB Output is correct
16 Correct 57 ms 576 KB Output is correct
17 Correct 90 ms 664 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 700 ms 512 KB Output is correct
2 Correct 552 ms 528 KB Output is correct
3 Correct 427 ms 536 KB Output is correct
4 Correct 2 ms 492 KB Output is correct
5 Correct 4 ms 420 KB Output is correct
6 Correct 2 ms 492 KB Output is correct
7 Correct 570 ms 532 KB Output is correct
8 Correct 571 ms 536 KB Output is correct
9 Correct 482 ms 416 KB Output is correct
10 Correct 502 ms 548 KB Output is correct
11 Correct 3 ms 488 KB Output is correct
12 Correct 3 ms 492 KB Output is correct
13 Correct 2 ms 504 KB Output is correct
14 Correct 2 ms 500 KB Output is correct
15 Correct 0 ms 492 KB Output is correct
16 Correct 401 ms 560 KB Output is correct
17 Correct 483 ms 416 KB Output is correct
18 Correct 287 ms 416 KB Output is correct
19 Correct 389 ms 416 KB Output is correct
20 Correct 448 ms 420 KB Output is correct

Subtask #5
61.0 / 61.0

# Verdict Execution time Memory Grader output
1 Correct 402 ms 536 KB Output is correct
2 Correct 360 ms 612 KB Output is correct
3 Correct 714 ms 416 KB Output is correct
4 Correct 522 ms 416 KB Output is correct
5 Correct 545 ms 420 KB Output is correct
6 Correct 376 ms 544 KB Output is correct
7 Correct 360 ms 548 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 3 ms 492 KB Output is correct
10 Correct 1 ms 500 KB Output is correct
11 Correct 281 ms 540 KB Output is correct
12 Correct 439 ms 544 KB Output is correct
13 Correct 631 ms 536 KB Output is correct
14 Correct 620 ms 420 KB Output is correct
15 Correct 363 ms 532 KB Output is correct
16 Correct 386 ms 544 KB Output is correct
17 Correct 475 ms 424 KB Output is correct
18 Correct 385 ms 548 KB Output is correct
19 Correct 385 ms 548 KB Output is correct
20 Correct 303 ms 552 KB Output is correct
21 Correct 35 ms 592 KB Output is correct
22 Correct 60 ms 544 KB Output is correct
23 Correct 70 ms 656 KB Output is correct
24 Correct 3 ms 492 KB Output is correct
25 Correct 5 ms 496 KB Output is correct
26 Correct 2 ms 500 KB Output is correct
27 Correct 3 ms 492 KB Output is correct
28 Correct 1 ms 500 KB Output is correct
29 Correct 422 ms 536 KB Output is correct
30 Correct 397 ms 532 KB Output is correct
31 Correct 462 ms 420 KB Output is correct
32 Correct 346 ms 424 KB Output is correct
33 Correct 339 ms 480 KB Output is correct
34 Correct 246 ms 548 KB Output is correct
35 Correct 289 ms 548 KB Output is correct
36 Correct 309 ms 768 KB Output is correct
37 Correct 428 ms 656 KB Output is correct
38 Correct 332 ms 660 KB Output is correct
39 Correct 356 ms 664 KB Output is correct
40 Correct 428 ms 636 KB Output is correct
41 Correct 355 ms 704 KB Output is correct
42 Correct 43 ms 724 KB Output is correct
43 Correct 100 ms 660 KB Output is correct
44 Correct 115 ms 604 KB Output is correct
45 Correct 144 ms 628 KB Output is correct
46 Correct 279 ms 548 KB Output is correct
47 Correct 178 ms 544 KB Output is correct
48 Correct 54 ms 756 KB Output is correct
49 Correct 46 ms 700 KB Output is correct