Submission #338218

#	Time	Username	Problem	Language	Result	Execution time	Memory
338218		aryan12	Birthday gift (IZhO18_treearray)	C++17	0 / 100	4 ms	5100 KiB

treearray

#include <bits/stdc++.h>
using namespace std;

//for 56 points

const long long N = 2e5 + 10;
vector<long long> g[N];
long long tim = 0;
long long Start[N], End[N];

void dfs(long long node, long long par) {
    Start[node] = ++tim;
    for(long long i = 0; i < g[node].size(); i++) {
        if(g[node][i] != par) {
            dfs(g[node][i], node);
        }
    }
    End[node] = ++tim;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    long long n, m, q;
    cin >> n >> m >> q;
    for(long long i = 0; i < n - 1; i++) {
        long long v, u;
        cin >> v >> u;
        g[v].push_back(u);
        g[u].push_back(v);
    }
    dfs(1, -1);
    long long a[m + 1];
    for(long long i = 1; i <= m; i++) {
        cin >> a[i];
    }
    for(long long i = 1; i <= q; i++) {
        long long command;
        cin >> command;
        if(command == 1) {
            long long idx, val;
            cin >> idx >> val;
            a[idx] = val;
        }
        else {
            long long l, r, v;
            cin >> l >> r >> v;
            long long f = 0;
            for(long long j = l; j <= r; j++) {
                if(Start[v] < Start[a[j]] && End[v] > End[a[j]]) {
                    cout << j << " " << j << "\n";
                    f = 1;
                    break;
                }
            }
            if(f == 0) {
                cout << "-1 -1" << "\n";
            }
        }
    }
}

Compilation message (stderr)

treearray.cpp: In function 'void dfs(long long int, long long int)':
treearray.cpp:13:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for(long long i = 0; i < g[node].size(); i++) {
      |                          ~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 18
• Subtask 3: 0 / 26
• Subtask 4: 0 / 44