Submission #887067

#	Time	Username	Problem	Language	Result	Execution time	Memory
887067		beaboss	Sirni (COCI17_sirni)	C++14	140 / 140	1172 ms	633252 KiB

sirni

// Source: https://oj.uz/problem/view/COCI17_sirni
// 

#include "bits/stdc++.h"

using namespace std;

#define s second
#define f first
#define pb push_back

typedef long long ll;

typedef pair<int, int> pii;
typedef vector<pii> vpii;

typedef vector<int> vi;

#define FOR(i, a, b) for (int i = (a); i<b; i++)

bool ckmin(int& a, int b){ return b < a ? a = b, true : false; }

bool ckmax(int& a, int b){ return b > a ? a = b, true : false; }



const int P = 1e7 + 10;

vpii ed[P];
bool vals[P];
struct DSU {
	vector<int> e;
	DSU(int N) { e = vector<int>(N, -1); }

	// get representive component (uses path compression)
	int get(int x) { return e[x] < 0 ? x : e[x] = get(e[x]); }

	bool same_set(int a, int b) { return get(a) == get(b); }

	int size(int x) { return -e[get(x)]; }

	bool unite(int x, int y) {  // union by size
		x = get(x), y = get(y);
		if (x == y) return false;
		if (e[x] > e[y]) swap(x, y);
		e[x] += e[y];
		e[y] = x;
		return true;
	}
};

DSU dsu(P);

int nxt[P];

set<int> uni;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int n;
	cin >> n;

	FOR(i, 1, n + 1) {
		int k;
		cin >> k;
		vals[k]=true;
		uni.insert(k);
	}

	int largest = -1;
	int cur = largest;

	for (int i = P-1; i >= 0; i--) {
		if (vals[i]) largest=i;
		// if (largest != -1) cout << largest << endl;
		nxt[i] = largest;
	}

	for (auto cur: uni) {

		for (int e = cur; e < P; e += cur) {


			int val = nxt[e];
			if (e == cur) val = nxt[e+1];

			if (val == -1) break;
			
			if (val < e + cur) ed[val % cur].pb({cur, val});


			// cout << cur << val << endl;

			// if (it == uni.begin()) continue;
			// int val = *prev(it, 1);
			// while (val >= e) {
			// 	cout << cur << val << endl;
			// 	ed.pb({val - e, {cur, val}});
			// 	ub = (e + val) / 2;

			// 	if (val == e) break;

			// 	it = uni.upper_bound(ub);
			// 	if (it == uni.begin()) break;
			// 	val = *prev(it, 1);
			// } 
		}
	}


	int sz = 0;

	FOR(c, 0, P) {
		for (auto e: ed[c]) 
			if (dsu.unite(e.f, e.s)) sz += c;
	
	}

	cout << sz << endl;


}

Compilation message (stderr)

sirni.cpp: In function 'int main()':
sirni.cpp:73:6: warning: unused variable 'cur' [-Wunused-variable]
   73 |  int cur = largest;
      |      ^~~

• 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