Submission #316630

#	Time	Username	Problem	Language	Result	Execution time	Memory
316630		thecodingwizard	Walk (POI13_spa)	C++11	74 / 100	4554 ms	262144 KiB

spa

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int n, k; 
unordered_set<ll> dead;

ll read() {
    string s; cin >> s;
    ll num = 0;
    for (int i = n-1; i >= 0; i--) {
        if (s[n-1-i] == '1') {
            num |= (1LL << i);
        }
    }
    return num;
}

ll s[4000001];
unordered_set<ll> vis;
// return true if a can reach b or if a can reach at least ct nodes
bool solve(ll a, ll b, int ct) {
    vis.clear();
    int idx = 0;
    s[idx] = a;
    vis.insert(a);
    --ct;

    while (idx >= 0) {
        ll u = s[idx--];
        for (int i = 0; i < n; i++) {
            ll v = u ^ (1LL << i);
            if (vis.count(v) || dead.count(v)) continue;
            --ct;
            if (ct == 0 || v == b) return true;
            vis.insert(v);
            s[++idx] = v;
            assert(idx <= 4000000);
        }
    }
    return false;
}

int main() {
    cin.tie(0)->sync_with_stdio(0);

    cin >> n >> k;

    ll a, b; a = read(), b = read();
    if (a == b) {
        cout << "TAK\n";
        return 0;
    }
    for (int i = 0; i < k; i++) {
        ll x = read();
        dead.insert(x);
    }

    cout << (solve(a, b, n*k+1) && solve(b, a, n*k+1) ? "TAK" : "NIE") << endl;

    return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 12 / 12
• Subtask 3: 12 / 12
• Subtask 4: 12 / 12
• Subtask 5: 0 / 13
• Subtask 6: 13 / 13
• Subtask 7: 0 / 13
• Subtask 8: 13 / 13