Submission #956272

#	Time	Username	Problem	Language	Result	Execution time	Memory
956272		Trisanu_Das	Sirni (COCI17_sirni)	C++17	140 / 140	1870 ms	613712 KiB

sirni

#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef pair<int,int> ii;
 
const int MAXN = 1e7 + 1;
 
int pai[MAXN],proximo[MAXN],N;
vector<int> ordenado;
vector<ii> Kruskal[MAXN]; 
 
int find(int x){
	if(x == pai[x]) return x;
	return pai[x] = find(pai[x]);
}
 
void join(int x,int y){
	x = find(x);y = find(y);
	if(x == y) return;
	if(rand() & 1) swap(x,y);
	pai[y] = x;
}
 
int main(){
 
	scanf("%d",&N);
	for(int i = 1;i<=N;i++){
		int x;
		scanf("%d",&x);
		pai[x] = x;
	}
 
	for(int i = 1;i<MAXN;i++){
		if(pai[i] == 0) continue;
		ordenado.push_back(i);
		for(int j = 2*i;j<MAXN;j+=i) if(pai[j] != 0) join(i,j);
	}
 
	int ultimo_visto = ordenado.back();
 
	for(int i = MAXN-1;i>=1;i--){
		proximo[i] = ultimo_visto;
		if(!ordenado.empty() && ordenado.back() == i){
			ultimo_visto = i;
			ordenado.pop_back();
		}
	}
 
	for(int i = 1;i<MAXN;i++){
		if(pai[i] == 0) continue;
		ultimo_visto = -1;
		for(int j = i;j<MAXN;j+=i){
			int candidato = proximo[j];
			if(candidato == ultimo_visto) continue;
			ultimo_visto = candidato;
			Kruskal[candidato % i].push_back(ii(i,candidato));
		}
	}
 
	ll total = 0;
	for(int w = 0;w<MAXN;w++){
 
		for(ii davez : Kruskal[w]){
			int u = davez.first, v = davez.second;
			if(find(u) != find(v)){
				join(u,v);
				total += w;
			}
		}
		
	}
 
	printf("%lld\n",total);
 
	return 0;
}

Compilation message (stderr)

sirni.cpp: In function 'int main()':
sirni.cpp:27:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |  scanf("%d",&N);
      |  ~~~~~^~~~~~~~~
sirni.cpp:30:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |   scanf("%d",&x);
      |   ~~~~~^~~~~~~~~

• 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