Submission #451956

#	Time	Username	Problem	Language	Result	Execution time	Memory
451956		zxcvbnm	Pictionary (COCI18_pictionary)	C++14	140 / 140	115 ms	10188 KiB

pictionary

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int nax = 100'005;
struct Edge {
    int to, w;
};
int parent[nax];
int sz[nax];
int find(int v) {
    if (parent[v] == v) {
        return v;
    }
    return parent[v] = find(parent[v]);
}
bool unite(int a, int b) {
    a = find(a), b = find(b);
    if (a != b) {
        if (sz[a] < sz[b]) swap(a, b);
        parent[b] = a;
        sz[a] += sz[b];
        return true;
    }
    return false;
}
vector<Edge> adj[nax];

int par[nax], depth[nax], cost[nax];
void dfs(int v) {
    for(Edge u : adj[v]) {
        if (u.to == par[v]) continue;
        par[u.to] = v;
        depth[u.to] = depth[v] + 1;
        cost[u.to] = u.w;
        dfs(u.to);
    }
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, m, q;
    cin >> n >> m >> q;
    for(int i = 1; i <= n; i++) {
        parent[i] = i;
        sz[i] = 1;
    }
    for(int i = m; i >= 1; i--) {
        for(int j = i+i; j <= n; j+=i) {
            if (unite(i, j)) {
                adj[i].push_back({j, m-i+1});
                adj[j].push_back({i, m-i+1});
//                cout << i << "->" << j << " " << m-i+1 << "\n";
            }
        }
    }

    par[1] = -1;
    depth[1] = 0;
    cost[1] = 0;
    dfs(1);

    while(q--) {
        int x, y;
        cin >> x >> y;

        int dx = depth[x], dy = depth[y];
        int mx = 0;
        while(dx > dy) {
            mx = max(mx, cost[x]);
            x = par[x];
            dx--;
        }
        while(dy > dx) {
            mx = max(mx, cost[y]);
            y = par[y];
            dy--;
        }
        while(x != y) {
            mx = max({mx, cost[x], cost[y]});
            x = par[x];
            y = par[y];
        }
        cout << mx << "\n";
    }
    return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 14 / 14
• Subtask 6: 14 / 14
• Subtask 7: 14 / 14
• Subtask 8: 14 / 14
• Subtask 9: 14 / 14
• Subtask 10: 14 / 14