제출 #116606

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
116606		nvmdava	열대 식물원 (Tropical Garden) (IOI11_garden)	C++17	0 / 100	3 ms	604 KiB

garden

#include "garden.h"
#include "gardenlib.h"

int best[150001][2];
int cyc;
int len[150001];
int time[150001][2];
bool in[150001];
bool proc[150001];
bool doing[150001];
int dfs(int v){
	if(proc[v]) return time[v][1];
	if(doing[v] == 1) return 1000000001;
	doing[v] = 1;
	time[v][1] = dfs(best[v][1]) + 1;
	doing[v] = 0;
	proc[v] = 1;
	return time[v][1];
}

void count_routes(int N, int M, int P, int R[][2], int Q, int G[]){
	for(int i = 0; i < M; i++){
		int v = R[i][0], u = R[i][1];
		if(!best[v][0]) best[v][0] = u;
		else if(!best[v][1]) best[v][1] = u;
		if(!best[u][0]) best[u][0] = v;
		else if(!best[u][1]) best[u][1] = v;
	}
	for(int i = 0; i < N; i++)
		if(!best[i][1]) best[i][1] = best[i][0];

	int now = P;
	while(!in[now])	{
		in[now] = 1;
		cyc++;
		now = best[now][1];
	}
	if(now != P)
		cyc = 1000000001;
	proc[P] = 1;
	for(int i = 0; i < N; i++)
		if(!proc[i])dfs(i);
		
	for(int i = 0; i < N; i++){
		time[i][0] = time[best[i][0]][0] + 1;
		if(time[i][0] <= 150000)
			len[time[i][1]]++;
	}
	for(int i = cyc; i <= N; i++)
		len[i] += len[i - cyc];
	for(int i = 0; i < Q; i++){
		if(G[i] > N){
			G[i] = N - ((cyc - G[i] % cyc) % cyc);
		}
		answer(len[G[i]]);
	}
}

• Subtask 1: 0 / 49
• Subtask 2: 0 / 20
• Subtask 3: 0 / 31