Submission #679626

#	Time	Username	Problem	Language	Result	Execution time	Memory
679626		as111	Sirni (COCI17_sirni)	C++14	0 / 140	1546 ms	543288 KiB

sirni

#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <algorithm>
#include <queue>

#define MAXN 100000
#define MAXP 10000000
using namespace std;
typedef pair<int, int> pi;
int parent[MAXN + 5]; // initialize parent[i] = i
int findRoot(int a) {
	return parent[a] = (parent[a] == a ? a : findRoot(parent[a]));
}
int join(int a, int b) {
	a = findRoot(a);b = findRoot(b);
	if (a == b) {
		return 0;
	}
	parent[a] = b;
}
int N;
int Cards[MAXN + 5];
set<int> cards;
vector<pi> edges[MAXP + 5];; // PQ of edges
priority_queue<pair<int, pi>> PQ;

int card[MAXN + 5]; // value for each card ID
map<int, int> ID; // card value to card ID
int main() {
	cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> Cards[i];
		cards.insert(Cards[i]);
	}
	int i = 1;
	for (int c : cards) {
		ID[c] = i;
		card[i] = c;
		parent[i] = i;
		i++;
	}
	int mx = 0;
	for (int c : cards) {
		/*
		int s = i + 1;
		for (int j = card[i]; j < MAXP; j += card[i])
		{
			while (s < cards.size() && card[s] < j) s++;
			if (s < cards.size()) edges[card[s] % card[i]].emplace_back(i, s);
		}*/
		int mult = card[i]; // multiple
		auto it = cards.lower_bound(mult);
		while (it != cards.end()) {
			if (*it - mult > c) mult += (*it - mult) / c * c; // c can be increased
			mx = max(mx, *it - mult);
			edges[*it - mult].emplace_back(ID[c], ID[*it]); // negative weight to go from least to greatest
			mult += c;
			it = cards.lower_bound(mult);
		}
	}
	int ans = 0;
	for (int p = 0; p <= mx;p++) {
		for (auto curr : edges[p]) {
			int f = curr.first;
			int s = curr.second;
			if (join(f, s))ans += p;
		}
	}
	cout << ans;
}

Compilation message (stderr)

sirni.cpp: In function 'int join(int, int)':
sirni.cpp:21:12: warning: control reaches end of non-void function [-Wreturn-type]
   21 |  parent[a] = b;
      |  ~~~~~~~~~~^~~

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