Submission #769961

#	Time	Username	Problem	Language	Result	Execution time	Memory
769961		vjudge1	Klasika (COCI20_klasika)	C++17	0 / 110	259 ms	9992 KiB

klasika

#include <bits/stdc++.h>
#define ve vector
#define vi vector<int>
#define vii vector<ii>
#define ii pair<int,int>
#define fi first
#define se second
#define ll long long
#define INF 1e9+7
#define pb push_back
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template<class T>
using Tree = tree<T, null_type, less<T>, rb_tree_tag,
    tree_order_statistics_node_update>;
const int MOD = 1e9+7;
const int nax = 2e5+5;
void readio(){
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
}
vii adj[nax];
int cnt = 0, tin[nax], tout[nax];
bool isAnc(int u, int v){
    return (tin[u] <= tin[v] && tout[v] <= tout[u]);
}
void dfs(int u, int p){
    tin[u] = cnt++;
    for(auto x : adj[u]){
        if(x.fi == p ) continue;
        dfs(x.fi,u);
    }
    tout[u] = cnt++;
}
int srch(int u, int p,int cst, int sub){
    int mx = 0;
    if(isAnc(sub, u)) {
        //cout << u << endl;
        mx = cst;
    }
    for(auto x : adj[u]){
        if(x.fi == p) continue;
        mx = max(srch(x.fi,u, cst^x.se, sub), mx);
    } 
    return mx;
}
int main()
{
    optimise;
    //readio();
    int q;
    cin >> q;
    for (int i = 1; i <= q; ++i)
    {
        string type;
        cin >> type;
        if(type == "Add"){
            int x,y;
            cin >> x >> y;
            x--;
            adj[x].pb({i,y});
            adj[i].pb({x,y});
        } else {
            int a,b;
            cin >> a >> b;
            a--,b--;
            cnt = 0;
            dfs(0,0);
            cout << srch(a, -1, 0, b) << endl; 
        }
        
    }
}

Compilation message (stderr)

klasika.cpp: In function 'void readio()':
klasika.cpp:22:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
klasika.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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