oj.uz

Submission #880746

# Submission time Handle Problem Language Result Execution time Memory
880746 2023-11-30T01:20:19 Z tsumondai Fliper (COCI22_fliper) C++14
110 / 110
 534 ms 152152 KB 
#include<bits/stdc++.h>

using namespace std;

typedef long long llint;
typedef pair <int, int> pi;

const int MAXN = 1000005;

int n, ok = 1;
int x[MAXN], y[MAXN], par[MAXN], siz[MAXN], bio[MAXN], sol[MAXN];
char c[MAXN];
vector <int> sazx, sazy, nodes, edges, lef, rig;
vector <pi> vx[MAXN], vy[MAXN], v[MAXN];

void dsu_init () {
    for (int i = 0; i <= 2*n; i++) {
        par[i] = i;
        siz[i] = 1;
    }
}

int nadi (int a) {
    if (a == par[a]) return a;
    return par[a] = nadi(par[a]);
}

void spoji (int a, int b) {
    a = nadi(a);
    b = nadi(b);
    if (a == b) return;
    if (a > b) swap(a, b);
    par[a] = b;
    siz[b] += siz[a];
}

void sazmi () {
    for (int i = 0; i < n; i++) {
        sazx.push_back(x[i]);
        sazy.push_back(y[i]);
    }
    sort(sazx.begin(), sazx.end());
    sort(sazy.begin(), sazy.end());
    sazx.erase(unique(sazx.begin(), sazx.end()), sazx.end());
    sazy.erase(unique(sazy.begin(), sazy.end()), sazy.end());
    for (int i = 0; i < n; i++) {
        x[i] = lower_bound(sazx.begin(), sazx.end(), x[i]) - sazx.begin();
        y[i] = lower_bound(sazy.begin(), sazy.end(), y[i]) - sazy.begin();
    }
}

void find_cycles () {
    for (int i = 0; i < n; i++) {
        if (c[i] == '/') {
            vx[x[i]].push_back({2 * y[i] + 1, 2 * i + 0});
            vx[x[i]].push_back({2 * y[i] + 0, 2 * i + 1});
            vy[y[i]].push_back({2 * x[i] + 0, 2 * i + 0});
            vy[y[i]].push_back({2 * x[i] + 1, 2 * i + 1});
        } else {
            vx[x[i]].push_back({2 * y[i] + 1, 2 * i + 0});
            vx[x[i]].push_back({2 * y[i] + 0, 2 * i + 1});
            vy[y[i]].push_back({2 * x[i] + 1, 2 * i + 0});
            vy[y[i]].push_back({2 * x[i] + 0, 2 * i + 1});
        }
    }
    for (int i = 0; i < sazx.size(); i++) {
        sort(vx[i].begin(), vx[i].end());
        for (int j = 1; j + 1 < vx[i].size(); j += 2) {
            spoji(vx[i][j].second, vx[i][j + 1].second);
        }
        spoji(vx[i][0].second, 2 * n);
        spoji(vx[i].back().second, 2 * n);
    }
    for (int i = 0; i < sazy.size(); i++) {
        sort(vy[i].begin(), vy[i].end());
        for (int j = 1; j + 1 < vy[i].size(); j += 2) {
            spoji(vy[i][j].second, vy[i][j + 1].second);
        }
        spoji(vy[i][0].second, 2 * n);
        spoji(vy[i].back().second, 2 * n);
    }
}

void build_graph () {
    for (int i = 0; i <= 2 * n; i++) {
        if (i == par[i]) {
            nodes.push_back(i);
            if (i < 2 * n && siz[i] % 8 != 0) ok = 0;
        }
    }
    for (int i = 0; i < n; i++) {
        int a = nadi(2 * i);
        int b = nadi(2 * i + 1);
        v[a].push_back({b, i});
        v[b].push_back({a, i});
    }
}

void euler (int x) {
    while (v[x].size()) {
        int to = v[x].back().first;
        int ind = v[x].back().second;
        v[x].pop_back();
        if (bio[ind]) continue;
        bio[ind] = 1;
        euler(to);
        edges.push_back(ind);
    }
}

void solve () {
    euler(2 * n);
    for (int i = 0; i < edges.size(); i++) {
        if (i % 2 == 0) lef.push_back(edges[i]);
        if (i % 2 == 1) rig.push_back(edges[i]);
    }
    edges.clear();
    memset(bio, 0, sizeof bio);

    for (auto i : lef) {
        int a = nadi(2 * i);
        int b = nadi(2 * i + 1);
        v[a].push_back({b, i});
        v[b].push_back({a, i});
    }
    for (int i = (int)nodes.size() - 1; i >= 0; i--) {
        euler(nodes[i]);
    }
    for (int i = 0; i < edges.size(); i++) {
        sol[edges[i]] = 1 + i % 2;
    }
    edges.clear();
    memset(bio, 0, sizeof bio);

    for (auto i : rig) {
        int a = nadi(2 * i);
        int b = nadi(2 * i + 1);
        v[a].push_back({b, i});
        v[b].push_back({a, i});
    }
    for (int i = (int)nodes.size() - 1; i >= 0; i--) {
        euler(nodes[i]);
    }
    for (int i = 0; i < edges.size(); i++) {
        sol[edges[i]] = 3 + i % 2;
    }
    edges.clear();
    memset(bio, 0, sizeof bio);
}

void ispis () {
    for (int i = 0; i < n; i++) {
        cout << sol[i] << " ";
    }
}

int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin >> n;
    dsu_init();
    for (int i = 0; i < n; i++) {
        cin >> x[i] >> y[i] >> c[i];
    }
    sazmi();
    find_cycles();
    build_graph();
    if (!ok) {
        cout << "-1";
        return 0;
    }
    solve();
    ispis();
    return 0;
}

Compilation message

Main.cpp: In function 'void find_cycles()':
Main.cpp:66:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |     for (int i = 0; i < sazx.size(); i++) {
      |                     ~~^~~~~~~~~~~~~
Main.cpp:68:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |         for (int j = 1; j + 1 < vx[i].size(); j += 2) {
      |                         ~~~~~~^~~~~~~~~~~~~~
Main.cpp:74:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |     for (int i = 0; i < sazy.size(); i++) {
      |                     ~~^~~~~~~~~~~~~
Main.cpp:76:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |         for (int j = 1; j + 1 < vy[i].size(); j += 2) {
      |                         ~~~~~~^~~~~~~~~~~~~~
Main.cpp: In function 'void solve()':
Main.cpp:113:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  113 |     for (int i = 0; i < edges.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~
Main.cpp:129:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  129 |     for (int i = 0; i < edges.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~
Main.cpp:144:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  144 |     for (int i = 0; i < edges.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 83292 KB Output is correct
2 Correct 18 ms 83292 KB Output is correct
3 Correct 19 ms 83292 KB Output is correct
4 Correct 17 ms 83292 KB Output is correct
5 Correct 17 ms 80476 KB Output is correct
6 Correct 17 ms 80476 KB Output is correct
7 Correct 19 ms 83292 KB Output is correct
8 Correct 17 ms 80476 KB Output is correct
9 Correct 17 ms 83292 KB Output is correct
10 Correct 16 ms 80476 KB Output is correct
11 Correct 18 ms 83292 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 457 ms 152152 KB Output is correct
2 Correct 419 ms 151892 KB Output is correct
3 Correct 389 ms 148552 KB Output is correct
4 Correct 339 ms 143044 KB Output is correct
5 Correct 279 ms 137240 KB Output is correct
6 Correct 260 ms 135708 KB Output is correct
7 Correct 301 ms 140864 KB Output is correct
8 Correct 279 ms 136816 KB Output is correct
9 Correct 18 ms 80664 KB Output is correct
10 Correct 259 ms 134948 KB Output is correct
11 Correct 17 ms 80476 KB Output is correct
12 Correct 18 ms 83292 KB Output is correct
13 Correct 16 ms 80476 KB Output is correct
14 Correct 17 ms 83292 KB Output is correct

Subtask #3
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 83292 KB Output is correct
2 Correct 18 ms 83292 KB Output is correct
3 Correct 19 ms 83292 KB Output is correct
4 Correct 17 ms 83292 KB Output is correct
5 Correct 17 ms 80476 KB Output is correct
6 Correct 17 ms 80476 KB Output is correct
7 Correct 19 ms 83292 KB Output is correct
8 Correct 17 ms 80476 KB Output is correct
9 Correct 17 ms 83292 KB Output is correct
10 Correct 16 ms 80476 KB Output is correct
11 Correct 18 ms 83292 KB Output is correct
12 Correct 457 ms 152152 KB Output is correct
13 Correct 419 ms 151892 KB Output is correct
14 Correct 389 ms 148552 KB Output is correct
15 Correct 339 ms 143044 KB Output is correct
16 Correct 279 ms 137240 KB Output is correct
17 Correct 260 ms 135708 KB Output is correct
18 Correct 301 ms 140864 KB Output is correct
19 Correct 279 ms 136816 KB Output is correct
20 Correct 18 ms 80664 KB Output is correct
21 Correct 259 ms 134948 KB Output is correct
22 Correct 17 ms 80476 KB Output is correct
23 Correct 18 ms 83292 KB Output is correct
24 Correct 16 ms 80476 KB Output is correct
25 Correct 17 ms 83292 KB Output is correct
26 Correct 534 ms 152000 KB Output is correct
27 Correct 448 ms 149828 KB Output is correct
28 Correct 436 ms 146808 KB Output is correct
29 Correct 374 ms 142888 KB Output is correct
30 Correct 311 ms 135948 KB Output is correct
31 Correct 304 ms 134888 KB Output is correct
32 Correct 346 ms 141268 KB Output is correct
33 Correct 341 ms 137808 KB Output is correct
34 Correct 332 ms 131528 KB Output is correct
35 Correct 291 ms 131700 KB Output is correct
36 Correct 323 ms 131664 KB Output is correct
37 Correct 17 ms 80732 KB Output is correct
38 Correct 297 ms 135332 KB Output is correct
39 Correct 17 ms 80476 KB Output is correct
40 Correct 18 ms 83292 KB Output is correct
41 Correct 17 ms 80472 KB Output is correct
42 Correct 17 ms 83292 KB Output is correct