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Submission #444697

# Submission time Handle Problem Language Result Execution time Memory
444697 2021-07-14T21:28:00 Z Aryan_Raina Pipes (BOI13_pipes) C++17
100 / 100
 235 ms 40248 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define int int64_t
#define ld long double
#define ar array
#define all(a) a.begin(), a.end()
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int INF = 1e15;

void solve() {
    int N, M; cin >> N >> M;
    vector<ar<int,2>> g[N];
    vector<int> C(N), ans(M), degree(N, 0);
    for (int &i : C) cin >> i;

    for (int i = 0; i < M; i++) {
        int u, v; cin >> u >> v;
        --u, --v;
        g[u].push_back({v, i});
        g[v].push_back({u, i});
        degree[u]++;
        degree[v]++;
    }

    if (M > N) {
        cout << "0\n";
        return;
    }

    queue<int> q;
    for (int i = 0; i < N; i++)
        if (degree[i] == 1) q.push(i);

    while (!q.empty()) {
        int u = q.front(); q.pop();
        for (auto [v,i] : g[u]) if (degree[v]) {
            degree[v]--; degree[u]--;
            C[v] -= (ans[i] = C[u]);
            if (degree[v] == 1) q.push(v);
        }
    }

    if (N-1 == M) {
        for (int i : ans) cout << 2*i << '\n';
        return;
    }

    vector<ar<int,2>> shit;
    for (int x = 0; x < N; x++) if (degree[x] == 2) {
        for (int u = x; u >= 0; ) {
            int nex = -1;
            for (auto [v,i] : g[u]) if (degree[v] == 2){
                shit.push_back({v, i});
                degree[v]--; degree[u]--;
                nex = v;
                break;
            }
            u = nex;
        }

        for (auto [v, i] : g[x]) if (degree[v] == 1) shit.push_back({x, i});
    }

    int lol = 0;
    for (int i = 0; i < shit.size(); i++) {
        if (i&1) lol -= C[shit[i][0]];
        else lol += C[shit[i][0]];
    }

    if (!(shit.size()&1) || lol&1) {
        cout << "0\n"; 
        return;
    }

    lol /= 2;
    for (int i = 0; i < shit.size(); i++) {
        ans[shit[i][1]] = lol;
        lol = C[shit[i][0]] - lol;
    }

    for (int i : ans) cout << 2*i << '\n';
}
 
int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0); 
 
    int t = 1; //cin >> t;
    while (t--) solve();   
}

Compilation message

pipes.cpp: In function 'void solve()':
pipes.cpp:67:23: warning: comparison of integer expressions of different signedness: 'int64_t' {aka 'long int'} and 'std::vector<std::array<long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |     for (int i = 0; i < shit.size(); i++) {
      |                     ~~^~~~~~~~~~~~~
pipes.cpp:78:23: warning: comparison of integer expressions of different signedness: 'int64_t' {aka 'long int'} and 'std::vector<std::array<long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |     for (int i = 0; i < shit.size(); i++) {
      |                     ~~^~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 73 ms 12504 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 54 ms 10012 KB Output is correct
14 Correct 66 ms 11804 KB Output is correct
15 Correct 88 ms 12480 KB Output is correct
16 Correct 76 ms 10604 KB Output is correct
17 Correct 86 ms 12440 KB Output is correct
18 Correct 77 ms 12592 KB Output is correct
19 Correct 84 ms 12172 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 332 KB Output is correct
22 Correct 77 ms 12556 KB Output is correct
23 Correct 57 ms 9972 KB Output is correct
24 Correct 72 ms 12520 KB Output is correct
25 Correct 66 ms 10468 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 456 KB Output is correct
3 Correct 59 ms 12264 KB Output is correct
4 Correct 55 ms 11760 KB Output is correct
5 Correct 57 ms 11404 KB Output is correct
6 Correct 231 ms 40248 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 460 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 324 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 2 ms 460 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 58 ms 10952 KB Output is correct
24 Correct 77 ms 13316 KB Output is correct
25 Correct 61 ms 12292 KB Output is correct
26 Correct 62 ms 11716 KB Output is correct
27 Correct 51 ms 11600 KB Output is correct
28 Correct 52 ms 12112 KB Output is correct
29 Correct 191 ms 33024 KB Output is correct
30 Correct 78 ms 12724 KB Output is correct
31 Correct 86 ms 13884 KB Output is correct
32 Correct 81 ms 12752 KB Output is correct
33 Correct 109 ms 13016 KB Output is correct
34 Correct 57 ms 11680 KB Output is correct
35 Correct 58 ms 11788 KB Output is correct
36 Correct 56 ms 11844 KB Output is correct
37 Correct 235 ms 40248 KB Output is correct
38 Correct 81 ms 13024 KB Output is correct
39 Correct 79 ms 12576 KB Output is correct
40 Correct 77 ms 13096 KB Output is correct
41 Correct 67 ms 13884 KB Output is correct
42 Correct 52 ms 11672 KB Output is correct
43 Correct 57 ms 11632 KB Output is correct
44 Correct 63 ms 11332 KB Output is correct
45 Correct 170 ms 34756 KB Output is correct
46 Correct 83 ms 12876 KB Output is correct
47 Correct 85 ms 13136 KB Output is correct
48 Correct 94 ms 13864 KB Output is correct
49 Correct 66 ms 11540 KB Output is correct
50 Correct 55 ms 11792 KB Output is correct
51 Correct 58 ms 11668 KB Output is correct
52 Correct 81 ms 11580 KB Output is correct
53 Correct 195 ms 34768 KB Output is correct
54 Correct 83 ms 12824 KB Output is correct