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Submission #405018

# Submission time Handle Problem Language Result Execution time Memory
405018 2021-05-15T14:55:34 Z phathnv Highway Tolls (IOI18_highway) C++11
90 / 100
 362 ms 15048 KB 
#include <bits/stdc++.h>
#include "highway.h"

using namespace std;

const int MAXN = 90000;

int n, m, tIn[MAXN], timer;
vector<int> u, v, adj[MAXN], adjTree[MAXN];
bool visited[MAXN];
long long allA;

void Dfs(int u, int p) {
    tIn[u] = timer++;
    for(int v : adjTree[u])
        if (v != p)
            Dfs(v, u);
}

void BuildTree(int s) {
    for(int i = 0; i < n; i++){
        adjTree[i].clear();
        visited[i] = 0;
    }
    queue<int> qu;
    visited[s] = 1;
    qu.push(s);
    while (!qu.empty()) {
        int u = qu.front();
        qu.pop();
        for(int v : adj[u])
            if (!visited[v]) {
                visited[v] = 1;
                qu.push(v);
                adjTree[u].push_back(v);
                adjTree[v].push_back(u);
            }
    }
    timer = 0;
    Dfs(s, -1);
}

long long MyAsk(int l, int r) {
    vector<int> w(m);
    for(int i = 0; i < m; i++)
        if ((l <= tIn[u[i]] && tIn[u[i]] <= r) || (l <= tIn[v[i]] && tIn[v[i]] <= r))
            w[i] = 1;
        else
            w[i] = 0;
    return ask(w);
}

int Find_city() {
    assert(timer == n);
    int l = 0, r = n - 1, res = -1;
    while (l <= r) {
        int mid = (l + r) >> 1;
        if (MyAsk(mid, n - 1) != allA) {
            res = mid;
            l = mid + 1;
        } else {
            r = mid - 1;
        }
    }
    for(int i = 0; i < n; i++)
        if (tIn[i] == res)
            return i;
    assert(0);
}

void find_pair(int _n, vector<int> _u, vector<int> _v, int a, int b) {
    n = _n;
    u = _u;
    v = _v;
    m = u.size();
    for(int i = 0; i < m; i++) {
        adj[u[i]].push_back(v[i]);
        adj[v[i]].push_back(u[i]);
    }
    iota(tIn, tIn + n, 0);
    timer = n;
    allA = MyAsk(-1, -1);
    int root = Find_city();
    BuildTree(root);
    int s = Find_city();
    BuildTree(s);
    int t = Find_city();
    answer(s, t);
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4424 KB Output is correct
2 Correct 4 ms 4424 KB Output is correct
3 Correct 4 ms 4424 KB Output is correct
4 Correct 3 ms 4424 KB Output is correct
5 Correct 4 ms 4536 KB Output is correct
6 Correct 4 ms 4424 KB Output is correct
7 Correct 3 ms 4536 KB Output is correct
8 Correct 4 ms 4424 KB Output is correct
9 Correct 4 ms 4424 KB Output is correct
10 Correct 3 ms 4504 KB Output is correct
11 Correct 4 ms 4424 KB Output is correct
12 Correct 3 ms 4424 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 4552 KB Output is correct
2 Correct 19 ms 5448 KB Output is correct
3 Correct 222 ms 13360 KB Output is correct
4 Correct 205 ms 13316 KB Output is correct
5 Correct 213 ms 13324 KB Output is correct
6 Correct 260 ms 13332 KB Output is correct
7 Correct 201 ms 13308 KB Output is correct
8 Correct 180 ms 13300 KB Output is correct
9 Correct 224 ms 13308 KB Output is correct
10 Correct 234 ms 13352 KB Output is correct
11 Correct 236 ms 13556 KB Output is correct
12 Correct 211 ms 13932 KB Output is correct
13 Correct 199 ms 13596 KB Output is correct
14 Correct 221 ms 13416 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 5576 KB Output is correct
2 Correct 39 ms 6740 KB Output is correct
3 Correct 59 ms 7928 KB Output is correct
4 Correct 119 ms 14396 KB Output is correct
5 Correct 160 ms 14344 KB Output is correct
6 Correct 132 ms 14824 KB Output is correct
7 Correct 119 ms 15000 KB Output is correct
8 Correct 116 ms 14564 KB Output is correct
9 Correct 169 ms 14620 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 4552 KB Output is correct
2 Correct 24 ms 5500 KB Output is correct
3 Correct 180 ms 11376 KB Output is correct
4 Correct 225 ms 13312 KB Output is correct
5 Correct 213 ms 13348 KB Output is correct
6 Correct 171 ms 13308 KB Output is correct
7 Correct 233 ms 13324 KB Output is correct
8 Correct 221 ms 13268 KB Output is correct
9 Correct 207 ms 13332 KB Output is correct
10 Correct 237 ms 13412 KB Output is correct
11 Correct 241 ms 13424 KB Output is correct
12 Correct 205 ms 13660 KB Output is correct
13 Correct 237 ms 13532 KB Output is correct
14 Correct 248 ms 13908 KB Output is correct
15 Correct 204 ms 13504 KB Output is correct
16 Correct 228 ms 13384 KB Output is correct
17 Correct 255 ms 13568 KB Output is correct
18 Correct 243 ms 13848 KB Output is correct
19 Correct 235 ms 13320 KB Output is correct
20 Correct 215 ms 13956 KB Output is correct
21 Correct 177 ms 14152 KB Output is correct
22 Correct 153 ms 14212 KB Output is correct
23 Correct 167 ms 13980 KB Output is correct
24 Correct 186 ms 14104 KB Output is correct
25 Correct 173 ms 15048 KB Output is correct

Subtask #5
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 5436 KB Output is correct
2 Correct 24 ms 5448 KB Output is correct
3 Correct 228 ms 13876 KB Output is correct
4 Correct 289 ms 14020 KB Output is correct
5 Correct 323 ms 14696 KB Output is correct
6 Correct 304 ms 14736 KB Output is correct
7 Correct 343 ms 14720 KB Output is correct
8 Correct 289 ms 14720 KB Output is correct
9 Correct 205 ms 11476 KB Output is correct
10 Correct 268 ms 11500 KB Output is correct
11 Correct 226 ms 12600 KB Output is correct
12 Correct 336 ms 13596 KB Output is correct
13 Correct 275 ms 14108 KB Output is correct
14 Correct 327 ms 14488 KB Output is correct
15 Correct 307 ms 14448 KB Output is correct
16 Correct 265 ms 11996 KB Output is correct
17 Correct 231 ms 14304 KB Output is correct
18 Correct 192 ms 14428 KB Output is correct
19 Correct 223 ms 14300 KB Output is correct
20 Correct 198 ms 14568 KB Output is correct
21 Correct 270 ms 14516 KB Output is correct

Subtask #6
21.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 5440 KB Output is correct
2 Correct 26 ms 5548 KB Output is correct
3 Correct 277 ms 13720 KB Output is correct
4 Partially correct 242 ms 13940 KB Output is partially correct
5 Partially correct 306 ms 14028 KB Output is partially correct
6 Partially correct 281 ms 14732 KB Output is partially correct
7 Correct 282 ms 13908 KB Output is correct
8 Correct 232 ms 13944 KB Output is correct
9 Correct 282 ms 14108 KB Output is correct
10 Correct 338 ms 14724 KB Output is correct
11 Partially correct 340 ms 14724 KB Output is partially correct
12 Partially correct 361 ms 14716 KB Output is partially correct
13 Correct 280 ms 12456 KB Output is correct
14 Correct 247 ms 11364 KB Output is correct
15 Correct 251 ms 11992 KB Output is correct
16 Correct 247 ms 11480 KB Output is correct
17 Correct 295 ms 12424 KB Output is correct
18 Correct 279 ms 11452 KB Output is correct
19 Correct 253 ms 13500 KB Output is correct
20 Partially correct 359 ms 13896 KB Output is partially correct
21 Partially correct 338 ms 14592 KB Output is partially correct
22 Partially correct 362 ms 14396 KB Output is partially correct
23 Correct 300 ms 14540 KB Output is correct
24 Correct 346 ms 14532 KB Output is correct
25 Partially correct 354 ms 14420 KB Output is partially correct
26 Partially correct 311 ms 14552 KB Output is partially correct
27 Correct 170 ms 14428 KB Output is correct
28 Correct 186 ms 14276 KB Output is correct
29 Correct 175 ms 14620 KB Output is correct
30 Partially correct 177 ms 14472 KB Output is partially correct
31 Partially correct 166 ms 14372 KB Output is partially correct
32 Correct 221 ms 14288 KB Output is correct
33 Partially correct 210 ms 14548 KB Output is partially correct
34 Correct 220 ms 14428 KB Output is correct
35 Partially correct 206 ms 14324 KB Output is partially correct
36 Correct 219 ms 14284 KB Output is correct
37 Partially correct 215 ms 14504 KB Output is partially correct
38 Correct 236 ms 14440 KB Output is correct
39 Partially correct 281 ms 14604 KB Output is partially correct
40 Correct 307 ms 14708 KB Output is correct
41 Partially correct 294 ms 14504 KB Output is partially correct
42 Correct 279 ms 14488 KB Output is correct