Submission #582718

#	Time	Username	Problem	Language	Result	Execution time	Memory
582718		dxz05	Logičari (COCI21_logicari)	C++14	20 / 110	1045 ms	11720 KiB

Main

#pragma GCC optimize("Ofast,O2,O3,unroll-loops")
#pragma GCC target("avx2")

#include <bits/stdc++.h>

#include <random>

using namespace std;

void debug_out() { cerr << endl; }

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << "[" << H << "]";
    debug_out(T...);
}

#ifdef dddxxz
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SZ(s) ((int)s.size())
#define all(x) (x).begin(), (x).end()
#define lla(x) (x).rbegin(), (x).rend()
#define bpc(x) __builtin_popcount(x)
#define bpcll(x) __builtin_popcountll(x)

clock_t startTime;

double getCurrentTime() {
    return (double) (clock() - startTime) / CLOCKS_PER_SEC;
}

#define MP make_pair

typedef long long ll;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const double eps = 0.000001;
const int MOD = 1e9 + 7;
const int INF = 1000000101;
const long long LLINF = 1223372000000000555;
const int N = 1e6 + 3e2;
const int M = 1111;

int stress(vector<vector<int>> g){
    int n = g.size();
    int ans = -1;
    for (int mask = 0; mask < (1 << n); mask++){
        vector<bool> flag(n);
        for (int i = 0; i < n; i++) flag[i] = mask & (1 << i);

        bool ok = true;
        for (int i = 0; i < n; i++){
            int cnt = 0;
            for (int j : g[i]) cnt += flag[j];

            if (cnt != 1) ok = false;
        }

        if (ok){
            if (ans == -1) ans = bpc(mask); else
                ans = min(ans, bpc(mask));
        }

    }

    return ans;
}

int logicari(vector<vector<int>> g){
    int n = g.size();
    vector<int> color(n, -1);

    bool ok = false;
    for (int i = 0; i < n; i++){
        if (g[i].size() == 1){
            color[g[i][0]] = 1;
            ok = true;
        }
    }

    if (!ok) return (n % 4 == 0 ? n / 2 : -1);

    for (int it = 1; it <= (n + 5) * (n + 5); it++){
        for (int i = 0; i < n; i++){
            int black = 0, white = 0;
            for (int j : g[i]){
                if (color[j] == 0) white++;
                if (color[j] == 1) black++;
            }

            int sz = (int)g[i].size();

            if (black == 1){
                for (int j : g[i]){
                    if (color[j] == -1) color[j] = 0;
                }
            } else if (white == sz - 1){
                for (int j : g[i]){
                    if (color[j] == -1) color[j] = 1;
                }
            }

        }

    }

    for (int i = 0; i < n; i++) cout << color[i] << ' '; cout << endl;

    for (int i = 0; i < n; i++){
        if (color[i] == -1) return -1;
    }

    int ans = 0;
    for (int i = 0; i < n; i++){
        ans += color[i];

        int cnt = 0;
        for (int j : g[i]) cnt += color[j] == 1;

        if (cnt != 1) return -1;
    }

    return ans;
}

void solve(int TC) {
    int n;
    cin >> n;

    vector<vector<int>> g(n);
    for (int i = 1; i <= n; i++){
        int x, y;
        cin >> x >> y;
        --x, --y;
        g[x].push_back(y);
        g[y].push_back(x);
    }

    if (n <= 20) {
        cout << stress(g) << endl;
    } else {
        cout << logicari(g) << endl;
    }

}

int main() {
    startTime = clock();
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

#ifdef dddxxz
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    int TC = 1;
//    cin >> TC;

    for (int test = 1; test <= TC; test++) {
        //debug(test);
        //cout << "Case #" << test << ": ";
        solve(test);
    }

#ifdef dddxxz
    cerr << endl << "Time: " << int(getCurrentTime() * 1000) << " ms" << endl;
#endif

    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int logicari(std::vector<std::vector<int> >)':
Main.cpp:110:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  110 |     for (int i = 0; i < n; i++) cout << color[i] << ' '; cout << endl;
      |     ^~~
Main.cpp:110:58: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  110 |     for (int i = 0; i < n; i++) cout << color[i] << ' '; cout << endl;
      |                                                          ^~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 40
• Subtask 4: 0 / 50