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답안 #343472

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
343472 2021-01-04T00:52:32 Z ijxjdjd Min-max tree (BOI18_minmaxtree) C++14
58 / 100
 177 ms 22416 KB 
#include <bits/stdc++.h>

#define FR(i, N) for (int i = 0; i < int(N); i++)
using namespace std;


const int MAXN = (int)(7e4) + 5;
vector<int> adj[MAXN];
int par[MAXN];
int cpar[MAXN][2];
int tin[MAXN];
int tout[MAXN];
vector<int> color[MAXN];
vector<int> to[MAXN];
bool visited[MAXN];
bool seen[MAXN][2];
bool seenMax[MAXN];
int deg[MAXN];
int store[MAXN][3];
unordered_map<int, int> condense;
int rev[MAXN];
int timer = 0;
void root(int n, int p) {
    par[n] = p;
    cpar[n][0] = p;
    cpar[n][1] = p;
    tin[n] = timer++;
    for (int e : adj[n]) {
        if (e != p) {
            root(e, n);
        }
    }
    tout[n] = timer++;
}
int next(int n, int k) {
    if (!seen[n][k]) {
        return n;
    }
    return (cpar[n][k] = next(cpar[n][k], k));
}
bool is_ancestor(int a, int b) {
    return (tin[a] <= tin[b] && tout[a] >= tout[b]);
}
void apply(int a, int b, int z, int k) {
    rev[condense.size()] = z;
    condense[z] = condense.size();
    z = condense[z];
    if (is_ancestor(a, b) || is_ancestor(b, a)) {
        if (is_ancestor(a, b)) {
            swap(a, b);
        }
        a = next(a, k);
        while (!is_ancestor(a, b)) {
            color[z].push_back(a);
            to[a].push_back(z);
            seen[a][k] = true;
            a = next(a, k);
        }
        return;
    }
    int u = a;
    u = next(u, k);
    while (!is_ancestor(u, b)) {
        color[z].push_back(u);
        to[u].push_back(z);
        seen[u][k] = true;
        u = next(u, k);
    }
    b = next(b, k);
    while (!is_ancestor(b, a)) {
        color[z].push_back(b);
        to[b].push_back(z);
        seen[b][k] = true;
        b = next(b, k);
    }
}
int main()
{
//    freopen("input.in", "r", stdin);
    cin.tie(0);
    cin.sync_with_stdio(0);
    vector<int> mins;
    vector<int> maxs;
    int N;
    cin >> N;
    FR(i, N-1) {
        int a, b;
        cin >> a >> b;
        a--; b--;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    int K;
    cin >> K;
    FR(i, K) {
        char c;
        int x, y, z;
        cin >> c;
        cin >> x >> y >> z;
        x--, y--;
        store[i][0] = x;
        store[i][1] = y;
        store[i][2] = z;
        if (x != y) {
            if (c == 'm') {
                mins.push_back(i);
            }
            else {
                maxs.push_back(i);
            }
        }
    }
    sort(mins.begin(), mins.end(), [&] (const int& lhs, const int& rhs) {
         return store[lhs][2] > store[rhs][2];
            });
    sort(maxs.begin(), maxs.end(), [&] (const int& lhs, const int& rhs) {
     return store[lhs][2] < store[rhs][2];
        });
    root(0, 0);
    for (int i : mins) {
        apply(store[i][0], store[i][1], store[i][2], 0);
    }
    for (int i : maxs) {
        apply(store[i][0], store[i][1], store[i][2], 1);
    }
    queue<int> deq;
    unordered_set<int> unvis;
    for (int i = 0; i < condense.size(); i++) {
        deg[i] = color[i].size();
        if (deg[i] == 1) {
            deq.push(i);
        }
        else {
            unvis.insert(i);
        }
    }
    while (unvis.size() > 0) {
        while (deq.size() > 0) {
            int next = deq.front(); deq.pop();
            for (int j : color[next]) {
                if (!visited[j]) {
                    visited[j] = true;
                    cout << j+1 << " " << par[j]+1 << " " << rev[next] << '\n';
                    assert (to[j].size() >= 0);
                    for (int e : to[j]) {
                        deg[e]--;
                        if (deg[e] == 1 && unvis.count(e)) {
                            deq.push(e);
                            unvis.erase(e);
                        }
                    }
                    break;
                }
            }
        }
        if (unvis.size() > 0) {
            int j = *unvis.begin();
            unvis.erase(j);
            deq.push(j);
        }
    }
    for (int i = 1; i < N; i++) {
        if (!visited[i]) {
            if (to[i].size() > 0) {
                cout << par[i]+1 << " " << i+1 << " " << rev[to[i][0]] << '\n';
            }
            else {
                cout << par[i]+1 << " " << i+1 << " " << 1 << '\n';
            }
        }
    }
    return 0;
}

Compilation message

minmaxtree.cpp: In function 'int main()':
minmaxtree.cpp:128:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::unordered_map<int, int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  128 |     for (int i = 0; i < condense.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5356 KB Output is correct
2 Correct 4 ms 5356 KB Output is correct
3 Correct 4 ms 5356 KB Output is correct
4 Correct 4 ms 5356 KB Output is correct

Subtask #2
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 169 ms 22140 KB Output is correct
2 Correct 166 ms 19848 KB Output is correct
3 Correct 143 ms 19956 KB Output is correct
4 Correct 157 ms 22416 KB Output is correct
5 Correct 154 ms 19828 KB Output is correct
6 Correct 156 ms 20348 KB Output is correct
7 Correct 145 ms 19836 KB Output is correct

Subtask #3
29.0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 96 ms 15468 KB Output is correct
2 Correct 105 ms 15468 KB Output is correct
3 Correct 96 ms 16104 KB Output is correct
4 Correct 92 ms 17004 KB Output is correct
5 Correct 104 ms 16108 KB Output is correct
6 Correct 105 ms 16748 KB Output is correct
7 Correct 105 ms 15980 KB Output is correct
8 Correct 112 ms 15852 KB Output is correct

Subtask #4
0 / 42.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5356 KB Output is correct
2 Correct 4 ms 5356 KB Output is correct
3 Correct 4 ms 5356 KB Output is correct
4 Correct 4 ms 5356 KB Output is correct
5 Correct 169 ms 22140 KB Output is correct
6 Correct 166 ms 19848 KB Output is correct
7 Correct 143 ms 19956 KB Output is correct
8 Correct 157 ms 22416 KB Output is correct
9 Correct 154 ms 19828 KB Output is correct
10 Correct 156 ms 20348 KB Output is correct
11 Correct 145 ms 19836 KB Output is correct
12 Correct 96 ms 15468 KB Output is correct
13 Correct 105 ms 15468 KB Output is correct
14 Correct 96 ms 16104 KB Output is correct
15 Correct 92 ms 17004 KB Output is correct
16 Correct 104 ms 16108 KB Output is correct
17 Correct 105 ms 16748 KB Output is correct
18 Correct 105 ms 15980 KB Output is correct
19 Correct 112 ms 15852 KB Output is correct
20 Correct 177 ms 20916 KB Output is correct
21 Incorrect 137 ms 18804 KB Output isn't correct
22 Halted 0 ms 0 KB -