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Submission #279931

# Submission time Handle Problem Language Result Execution time Memory
279931 2020-08-22T12:06:45 Z hamerin Highway Tolls (IOI18_highway) C++17
100 / 100
 337 ms 12104 KB 
#include "highway.h"

#include <bits/stdc++.h>

#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")

using namespace std;

using i64 = long long;
using d64 = long double;
using pi = pair<int, int>;
using pli = pair<i64, i64>;
using ti = tuple<int, int, int>;
using tli = tuple<i64, i64, i64>;

#define iterall(cont) cont.begin(), cont.end()
#define prec(n) setprecision(n) << fixed

void find_pair(const int N, vector<int> U, vector<int> V, int A, int B) {
    const int M = U.size();

    i64 defaultDist = ask(vector<int>(M));
    int dst = defaultDist / A;

    int edgUsed;
    {
        int s = 0, e = M - 1;
        while (s < e) {
            int m = (s + e + 1) >> 1;

            vector<int> q(M);
            fill(q.begin(), q.begin() + m, 1);

            i64 d = ask(q);

            if (d == defaultDist)
                s = m;
            else
                e = m - 1;
        }

        edgUsed = s;
    }

    int u = U[edgUsed];
    int v = V[edgUsed];

    vector<vector<pi>> graph(N);
    for (int i = 0; i < M; i++) {
        graph[U[i]].emplace_back(V[i], i);
        graph[V[i]].emplace_back(U[i], i);
    }

    vector<int> vtyp(N), par(N);
    vector<i64> distu(N, -1), distv(N, -1);

    distu[u] = distv[v] = 0;

    {
        queue<int> que;
        que.emplace(u);

        while (!que.empty()) {
            auto cur = que.front();
            que.pop();

            for (auto [t, _] : graph[cur]) {
                if (distu[t] == -1) {
                    distu[t] = distu[cur] + 1;
                    par[t] = cur;
                    que.emplace(t);
                }
            }
        }
    }

    {
        queue<int> que;
        que.emplace(v);

        while (!que.empty()) {
            auto cur = que.front();
            que.pop();

            for (auto [t, _] : graph[cur]) {
                if (distv[t] == -1) {
                    distv[t] = distv[cur] + 1;
                    par[t] = cur;
                    que.emplace(t);
                }
            }
        }
    }

    int us, vs;

    for (int i = 0; i < N; i++) {
        if (distv[i] > distu[i]) vtyp[i] = 1;
        if (distu[i] > distv[i]) vtyp[i] = 2;
    }

    {
        vector<int> hb;
        for (int i = 0; i < N; i++)
            if (vtyp[i] == 1) hb.emplace_back(i);

        auto H = hb.size();

        sort(iterall(hb), [&](int l, int r) {
            return distu[l] < distu[r];
        });

        int s = 0, e = H - 1;
        while (s < e) {
            int m = (s + e + 1) >> 1;

            vector<int> q(M);
            vector<bool> c(N);
            for (int i = m; i < H; i++) c[hb[i]] = true;
            for (int i = 0; i < M; i++)
                if (c[U[i]] || c[V[i]]) q[i] = 1;

            i64 d = ask(q);
            if (d == defaultDist)
                e = m - 1;
            else
                s = m;
        }

        us = hb[s];
    }

    {
        vector<int> hb;
        for (int i = 0; i < N; i++)
            if (vtyp[i] == 2) hb.emplace_back(i);

        auto H = hb.size();

        sort(iterall(hb), [&](int l, int r) {
            return distv[l] < distv[r];
        });

        int s = 0, e = H - 1;
        while (s < e) {
            int m = (s + e + 1) >> 1;

            vector<int> q(M);
            vector<bool> c(N);
            for (int i = m; i < H; i++) c[hb[i]] = true;
            for (int i = 0; i < M; i++)
                if (c[U[i]] || c[V[i]]) q[i] = 1;

            i64 d = ask(q);
            if (d == defaultDist)
                e = m - 1;
            else
                s = m;
        }

        vs = hb[s];
    }

    answer(us, vs);
}

Compilation message

highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:120:31: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare]
  120 |             for (int i = m; i < H; i++) c[hb[i]] = true;
      |                             ~~^~~
highway.cpp:151:31: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare]
  151 |             for (int i = m; i < H; i++) c[hb[i]] = true;
      |                             ~~^~~
highway.cpp:24:9: warning: unused variable 'dst' [-Wunused-variable]
   24 |     int dst = defaultDist / A;
      |         ^~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 256 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 256 KB Output is correct
7 Correct 1 ms 256 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 256 KB Output is correct
12 Correct 1 ms 384 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 13 ms 1528 KB Output is correct
3 Correct 168 ms 10344 KB Output is correct
4 Correct 166 ms 10412 KB Output is correct
5 Correct 182 ms 10496 KB Output is correct
6 Correct 150 ms 10260 KB Output is correct
7 Correct 182 ms 10264 KB Output is correct
8 Correct 163 ms 10272 KB Output is correct
9 Correct 214 ms 10268 KB Output is correct
10 Correct 198 ms 10264 KB Output is correct
11 Correct 198 ms 9684 KB Output is correct
12 Correct 186 ms 9636 KB Output is correct
13 Correct 229 ms 9704 KB Output is correct
14 Correct 193 ms 9688 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 1400 KB Output is correct
2 Correct 23 ms 2400 KB Output is correct
3 Correct 56 ms 3396 KB Output is correct
4 Correct 164 ms 9676 KB Output is correct
5 Correct 173 ms 9696 KB Output is correct
6 Correct 177 ms 9596 KB Output is correct
7 Correct 133 ms 9732 KB Output is correct
8 Correct 128 ms 9700 KB Output is correct
9 Correct 134 ms 9620 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 17 ms 1404 KB Output is correct
3 Correct 117 ms 8060 KB Output is correct
4 Correct 172 ms 10264 KB Output is correct
5 Correct 198 ms 10288 KB Output is correct
6 Correct 214 ms 10264 KB Output is correct
7 Correct 178 ms 10280 KB Output is correct
8 Correct 208 ms 10264 KB Output is correct
9 Correct 184 ms 10240 KB Output is correct
10 Correct 200 ms 10256 KB Output is correct
11 Correct 229 ms 9712 KB Output is correct
12 Correct 217 ms 9656 KB Output is correct
13 Correct 239 ms 9652 KB Output is correct
14 Correct 223 ms 9704 KB Output is correct
15 Correct 200 ms 10296 KB Output is correct
16 Correct 205 ms 10296 KB Output is correct
17 Correct 202 ms 9684 KB Output is correct
18 Correct 191 ms 9700 KB Output is correct
19 Correct 150 ms 10296 KB Output is correct
20 Correct 187 ms 9688 KB Output is correct
21 Correct 166 ms 10432 KB Output is correct
22 Correct 184 ms 10528 KB Output is correct
23 Correct 197 ms 10376 KB Output is correct
24 Correct 206 ms 10292 KB Output is correct
25 Correct 172 ms 9756 KB Output is correct

Subtask #5
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 1408 KB Output is correct
2 Correct 18 ms 1536 KB Output is correct
3 Correct 182 ms 10544 KB Output is correct
4 Correct 247 ms 11088 KB Output is correct
5 Correct 306 ms 11896 KB Output is correct
6 Correct 271 ms 12096 KB Output is correct
7 Correct 271 ms 12008 KB Output is correct
8 Correct 267 ms 12040 KB Output is correct
9 Correct 248 ms 7628 KB Output is correct
10 Correct 204 ms 7976 KB Output is correct
11 Correct 271 ms 8972 KB Output is correct
12 Correct 319 ms 10568 KB Output is correct
13 Correct 326 ms 11432 KB Output is correct
14 Correct 337 ms 12024 KB Output is correct
15 Correct 319 ms 12036 KB Output is correct
16 Correct 246 ms 8684 KB Output is correct
17 Correct 154 ms 10484 KB Output is correct
18 Correct 207 ms 10808 KB Output is correct
19 Correct 156 ms 10556 KB Output is correct
20 Correct 191 ms 10768 KB Output is correct
21 Correct 274 ms 11968 KB Output is correct

Subtask #6
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 1400 KB Output is correct
2 Correct 18 ms 1528 KB Output is correct
3 Correct 266 ms 10656 KB Output is correct
4 Correct 236 ms 10880 KB Output is correct
5 Correct 209 ms 11056 KB Output is correct
6 Correct 297 ms 11976 KB Output is correct
7 Correct 181 ms 10632 KB Output is correct
8 Correct 185 ms 10956 KB Output is correct
9 Correct 227 ms 11036 KB Output is correct
10 Correct 282 ms 11992 KB Output is correct
11 Correct 297 ms 11880 KB Output is correct
12 Correct 299 ms 11924 KB Output is correct
13 Correct 206 ms 9060 KB Output is correct
14 Correct 171 ms 7884 KB Output is correct
15 Correct 195 ms 9044 KB Output is correct
16 Correct 193 ms 7964 KB Output is correct
17 Correct 206 ms 9056 KB Output is correct
18 Correct 191 ms 7920 KB Output is correct
19 Correct 280 ms 10560 KB Output is correct
20 Correct 242 ms 11516 KB Output is correct
21 Correct 263 ms 12020 KB Output is correct
22 Correct 278 ms 12000 KB Output is correct
23 Correct 329 ms 11932 KB Output is correct
24 Correct 332 ms 12032 KB Output is correct
25 Correct 261 ms 12004 KB Output is correct
26 Correct 285 ms 11992 KB Output is correct
27 Correct 176 ms 10600 KB Output is correct
28 Correct 200 ms 10504 KB Output is correct
29 Correct 190 ms 10760 KB Output is correct
30 Correct 171 ms 10640 KB Output is correct
31 Correct 159 ms 10600 KB Output is correct
32 Correct 212 ms 10496 KB Output is correct
33 Correct 213 ms 10784 KB Output is correct
34 Correct 172 ms 10528 KB Output is correct
35 Correct 180 ms 10556 KB Output is correct
36 Correct 167 ms 10452 KB Output is correct
37 Correct 169 ms 10728 KB Output is correct
38 Correct 168 ms 10688 KB Output is correct
39 Correct 283 ms 12104 KB Output is correct
40 Correct 276 ms 11868 KB Output is correct
41 Correct 266 ms 11912 KB Output is correct
42 Correct 276 ms 12032 KB Output is correct