Submission #109218

#	Time	Username	Problem	Language	Result	Execution time	Memory
109218		Frankenween	Ronald (COCI17_ronald)	C++17	120 / 120	47 ms	2552 KiB

ronald

#ifdef LOCAL
#define _GLIBCXX_DEBUG
#endif
#include <bits/stdc++.h>

#define ull unsigned long long
#define pll pair<ll, ll>
#define mp make_pair
#define ll long long
#define pb push_back
#define deb(x) cout << #x << " = " << x << endl
#define all(x) x.begin(), x.end()
#define ld long double
const ll mod1 = (ll)1e9 + 7;
const ll mod2 = (ll)1e9 + 9;
const ll BASE = 47;
const ll inf = (ll)1e18;
const long double e = 2.718281828459;
const long double pi = 3.141592653;
const ld EPS = 1e-9;


using namespace std;


template <class T>
istream& operator>>(istream &in, vector<T> &arr) {
    for (T &cnt : arr) {
        in >> cnt;
    }
    return in;
};


void solve() {
    ll n;
    cin >> n;
    vector<vector<bool>> g(n, vector<bool>(n));
    ll m;
    cin >> m;
    while (m--) {
        ll a, b;
        cin >> a >> b;
        a--;
        b--;
        g[a][b] = true;
        g[b][a] = true;
    }
    vector<bool> ev(n);
    for (int i = 1; i < n; i++) {
        if (ev[i - 1]) {
            if (g[i - 1][i]) {
                ev[i] = true;
            } else {
                ev[i] = false;
            }
        } else {
            if (g[i - 1][i]) {
                ev[i] = false;
            } else {
                ev[i] = true;
            }
        }
    }
    bool good = true;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < i; j++) {
            if (g[j][i]) {
                if (ev[i] ^ ev[j]) {
                    good = false;
                }
            } else {
                if (!(ev[i] ^ ev[j])) {
                    good = false;
                }
            }
        }
    }
    if (good) {
        cout << "DA";
        return;
    }
    ev[0] = true;
    for (int i = 1; i < n; i++) {
        if (ev[i - 1]) {
            if (g[i - 1][i]) {
                ev[i] = true;
            } else {
                ev[i] = false;
            }
        } else {
            if (g[i - 1][i]) {
                ev[i] = false;
            } else {
                ev[i] = true;
            }
        }
    }
    good = true;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < i; j++) {
            if (g[j][i]) {
                if (ev[i] ^ ev[j]) {
                    good = false;
                }
            } else {
                if (!(ev[i] ^ ev[j])) {
                    good = false;
                }
            }
        }
    }
    if (good) {
        cout << "DA";
        return;
    }
    cout << "NE";
}


int main() {
#ifndef LOCAL
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
#else
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    cout.precision(30);
    ll seed = time(0);
    //cerr << "Seed: " << seed << "\n";
    srand(seed);
    solve();
    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 15 / 15
• Subtask 6: 15 / 15
• Subtask 7: 15 / 15
• Subtask 8: 15 / 15