Submission #41201

#	Time	Username	Problem	Language	Result	Execution time	Memory
41201		IvanC	Sequence (BOI14_sequence)	C++14	34 / 100	1073 ms	1004 KiB

sequence

#include <bits/stdc++.h>
using namespace std;
random_device rd;
knuth_b gen(rd());
const int MAXN = 1e5 + 10;
int K,vetor[MAXN],freq[10][2];
int pretest[20];
int check(int ini){
	for(int i = ini,ptr = 1;ptr <= K;i++,ptr++){
		if(i == 0 && vetor[ptr] == 0) continue;
		int copia = i;
		while(copia != 0 && copia % 10 != vetor[ptr]) copia /= 10;
		if(copia == 0) return 0;
	}
	return 1;
}
int pretesting(int ini){
	for(int j = 0;j<19;j++){
		int ptr = pretest[j];
		int i = vetor[ptr];
		if(i == 0 && vetor[ptr] == 0) continue;
		int copia = i;
		while(copia != 0 && copia % 10 != vetor[ptr]) copia /= 10;
		if(copia == 0) return 0;
	}
	return 1;
}
void adiciona(int v){
	while(v != 0){
		freq[v % 10][0]++;
		v /= 10;
	}
}
void tira(int v){
	while(v != 0){
		freq[v % 10][0]--;
		v /= 10;
	}
}
int prune(int v){
	if(!pretesting(v)) return 1;
	for(int i = 0;i<=9;i++){
		if(freq[i][0] < freq[i][1]) return 0;
	}
	return 0;
}
int main(){	
	cin >> K;
	for(int i = 1;i<=K;i++){
		cin >> vetor[i];
		freq[vetor[i]][1]++;
	}
	for(int i = 0;i<19;i++){
		int aleatorio = 1 + (gen() % K);
		pretest[i] = aleatorio;
	}
	if(K <= 1000){
		for(int i = 1;i<=K;i++) adiciona(i);
		for(int i = 1;i<=1000000;i++){
			if(prune(i)){
				adiciona(i+K);
				tira(i);
			}
			if(check(i)){
				cout << i << endl;
				return 0;
			}
			adiciona(i+K);
			tira(i);
		}
	}
	if(vetor[1] == 9){
		int geratriz = 8;
		while(true){
			if(check(geratriz + 1)){
				cout << geratriz + 1 << endl;
				return 0;
			}
			geratriz *= 10;
			geratriz += 8;
		}
	}
	else if(vetor[1] == 0){
		int ini = 1;
		while(true){
			if(check(ini)){
				cout << ini << endl;
				return 0;
			}
			ini *= 10;
		}
	}
	else{
		int ini = vetor[1];
		while(true){
			if(check(ini)){
				cout << ini << endl;
				return 0;
			}
			ini *= 10;
		}
	}
	return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 0 / 33
• Subtask 3: 25 / 25
• Subtask 4: 0 / 33