Submission #998114

#	Time	Username	Problem	Language	Result	Execution time	Memory
998114		Trisanu_Das	September (APIO24_september)	C++17	0 / 100	1 ms	348 KiB

september

#include <bits/stdc++.h>
using namespace std;
 
const int MAX_N = 1e5 + 5;
const int MAX_M = 15;
 
class UnionFind {
private:
    vector<int> parent, size;
public:
    UnionFind(int n) : parent(n), size(n, 1) {
        iota(parent.begin(), parent.end(), 0); 
    }
 
    int find(int v) {
        if (parent[v] == v) return v; 
        return parent[v] = find(parent[v]);
    }
 
    void unite(int a, int b) {
        a = find(a);
        b = find(b);
        if (a != b) {
            if (size[a] < size[b]) swap(a, b);
            parent[b] = a;
            size[a] += size[b];
        }
    }
 
    int getSize(int v) {
        return size[find(v)];
    }
};
 
int solve(int n, int m, const vector<int> F, const vector<vector<int>> S) {
    vector<vector<int>> graph(n); 
    vector<UnionFind> uf(m, UnionFind(n)); 
    vector<set<int>> elements(m); 
 
    for (int i = 1; i < n; ++i) {
        graph[i].push_back(F[i]);
        graph[F[i]].push_back(i);
    }
 
    int answer = 0;
    for (int i = n - 2; i >= 0; --i) {
        bool isValid = true;
 
        for (int j = 0; j < m; ++j) {
            int x = S[j][i];
            elements[j].insert(x);
 
            for (int neighbor : graph[x]) {
                if (elements[j].count(neighbor)) {
                    uf[j].unite(x, neighbor);
                }
            }
 
            if (uf[j].getSize(x) != n - i) {
                isValid = false;
            }
        }
        if (n <= 1000) {
            for (int j = 1; j < m; ++j) {
                if (elements[j] != elements[j - 1]) {
                    isValid = false;
                }
            }
        }
        if (isValid) ++answer;
    }
 
    return answer;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 14
• Subtask 3: 0 / 5
• Subtask 4: 0 / 9
• Subtask 5: 0 / 5
• Subtask 6: 0 / 11
• Subtask 7: 0 / 9
• Subtask 8: 0 / 11
• Subtask 9: 0 / 9
• Subtask 10: 0 / 16