Submission #844540

#	Time	Username	Problem	Language	Result	Execution time	Memory
844540		vjudge1	Klasika (COCI20_klasika)	C++17	0 / 110	12 ms	19544 KiB

klasika

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
using namespace std;
#define int long long
 
const int MAXN = 2e5 + 5;

#ifndef ONLINE_JUDGE
    #define OPEN freopen(".in", "r", stdin); \
                 freopen(".out", "w", stdout);
#else
    #define OPEN void(23);
#endif

vector <pair <int, int>> adj[MAXN];
vector <pair <int, int>> radj[MAXN];
int cnt = 2;
int FindAns(int a, int b)
{
    vector <bool> sub(cnt + 5);
    function <void(int)> dfsSub = [&](int node) -> void
    {
        //cerr << node << " ";
        sub[node] = true;
        for(auto &[child, w] : adj[node]) 
            dfsSub(child);

        return;
    };

    dfsSub(b);

    int ans = 0;
    function <void(int, int, int)> dfs = [&](int node, int par, int sum) -> void
    {
        if(sub[node]) ans = max(ans, sum);
        for(auto &[child, w] : adj[node])
            if(child != par) 
                dfs(child, node, sum ^ w);

        for(auto &[child, w] : radj[node])
            if(child != par) 
                dfs(child, node, sum ^ w);
    };

    dfs(a, 0, 0);

    return ans;
}

void solve()
{
    int q; cin >> q;
    for(int i = 1; i <= q; i++)
    {
        string str; int a, b; cin >> str >> a >> b;
        if(str[0] == 'A')
        {
            adj[a].emplace_back(cnt, b);
            radj[cnt].emplace_back(a, b);
            cnt++;
        }
        else
        {
            cout << FindAns(a, b) << "\n";
        }
    }

    return;
}

int32_t main()
{
    OPEN;

    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

    int t = 1; //cin >> t;
    while(t--)
    {
        solve();
    }
}

Compilation message (stderr)

klasika.cpp: In function 'int32_t main()':
klasika.cpp:10:25: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     #define OPEN freopen(".in", "r", stdin); \
      |                  ~~~~~~~^~~~~~~~~~~~~~~~~~~
klasika.cpp:75:5: note: in expansion of macro 'OPEN'
   75 |     OPEN;
      |     ^~~~
klasika.cpp:11:25: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |                  freopen(".out", "w", stdout);
      |                  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
klasika.cpp:75:5: note: in expansion of macro 'OPEN'
   75 |     OPEN;
      |     ^~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 22
• Subtask 3: 0 / 33
• Subtask 4: 0 / 44