Submission #339541

#	Time	Username	Problem	Language	Result	Execution time	Memory
339541		Alex_tz307	Walk (POI13_spa)	C++17	88 / 100	5049 ms	120044 KiB

spa

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

const int HSIZE = 5e6 + 11,
          EMPTY = 0,
          KMAX = 500009;

int N, K, fprev[KMAX], fhash[KMAX], vprev[HSIZE], vhash[HSIZE], vfree = 1, ffree = 1;
ll x, y, forbidden[KMAX], vis[HSIZE], Q[HSIZE];

void hashSetInsert(ll *S, int *prev, int *Hash, int &free, ll val, int sz) {
    S[free] = val;
    prev[free] = Hash[val % sz];
    Hash[val % sz] = free++;
}

bool hashSetLookup(ll *S, int *prev, int *Hash, ll val, int sz) {
    for(int i = Hash[val % sz]; i > 0; i = prev[i])
        if(S[i] == val)
            return true;
    return false;
}

void hashSetClear(int *Hash, int &free, int sz) {
    free = 1;
    for(int i = 0; i < sz; ++i)
        Hash[i] = 0;
}

bool graphSearch(ll s, ll d, int bound) {
    int b = 0, e = 0, c = 1;
    Q[e++] = s;
    hashSetInsert(vis, vprev, vhash, vfree, s, HSIZE);
    while(b < e && c < bound) {
        ll v = Q[b++];
        for(int i = 0; i < N; ++i) {
            ll next = v ^ (1LL << i);
            if(next == d)
                return true;
            if(!hashSetLookup(forbidden, fprev, fhash, next, KMAX) && !hashSetLookup(vis, vprev, vhash, next, HSIZE)) {
                Q[e++] = next;
                hashSetInsert(vis, vprev, vhash, vfree, next, HSIZE);
                ++c;
            }
        }
    }
    if(c >= bound)
        return true;
    return false;
}

bool solve(ll s, ll d) {
    int bound = N * K + 1;
    bool a = graphSearch(s, d, bound);
    hashSetClear(vhash, vfree, HSIZE);
    bool b = graphSearch(d, s, bound);
    return a && b;
}

ll readBin() {
    string s;
    cin >> s;
    ll nr = 0;
    for(int i = N - 1; i >= 0; --i)
        if(s[i] == '1')
            nr += (1LL << (N - i - 1));
    return nr;
}

void read() {
    cin >> N >> K;
    x = readBin(), y = readBin();
    for(int i = 0; i < K; ++i) {
        ll a;
        a = readBin();
        hashSetInsert(forbidden, fprev, fhash, ffree, a, KMAX);
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    read();
    if(solve(x, y))
        cout << "TAK";
    else
        cout << "NIE";
}

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