Submission #136326

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
136326	2019-07-25T07:03:40 Z	김세빈(#3258)	Link (CEOI06_link)	C++14	72 / 100	473 ms	48648 KB

link

#include <bits/stdc++.h>

using namespace std;

vector <int> V[505050];
int D[505050], P[505050];
int K[505050];
int X[20][505050];
int chk1[505050], chk2[505050];
int n, k, ans;

void dfs(int p, int v)
{
	for(int &t: V[p]){
		dfs(t, 0);
		K[p] = max(K[p], K[t] - 1);
	}
	
	if(!v && !K[p]){
		ans ++; K[p] = k;
	}
}

int calc(vector <int> &V)
{
	int m, i, j, t, s, ret;
	
	ret = 1e9;
	
	m = V.size();
	for(i=0; i<m; i++){
		V.push_back(V[i]);
	}
	
	for(i=0, j=0; i<m+m; i++){
		for(; j<m+m && (j - i <= k || !V[j]); j++);
		X[0][i] = j;
	}
	
	X[0][m + m] = m + m;
	
	for(i=1; i<=19; i++){
		for(j=0; j<=m+m; j++){
			X[i][j] = X[i - 1][X[i - 1][j]];
		}
	}
	
	for(i=0; i<m; i++){
		s = 1; t = i;
		for(j=19; j>=0; j--){
			if(X[j][t] < m + i){
				t = X[j][t];
				s += 1 << j;
			}
		}
		ret = min(ret, s);
	}
	
	return ret;
}

int main()
{
	vector <int> T;
	int i, j, x, y;
	
	scanf("%d%d", &n, &k);
	
	for(i=1; i<=n; i++){
		scanf("%d%d", &x, &y);
		P[x] = y; D[y] ++;
	}
	
	K[1] = k + 1;
	
	for(i=1; i<=n; i++){
		for(j=i; !chk1[j]; j=P[j]) chk1[j] = i;
		if(chk1[j] != i) continue;
		for(; !chk2[j]; j=P[j]) chk2[j] = 1;
	}
	
	for(i=1; i<=n; i++){
		if(!chk2[i]){
			V[P[i]].push_back(i);
		}
	}
	
	for(i=1; i<=n; i++){
		if(chk2[i]) dfs(i, 1);
	}
	
	for(i=1; i<=n; i++){
		if(chk2[i]){
			for(j=i; chk2[j]; j=P[j]){
				K[P[j]] = max(K[P[j]], K[j] - 1);
				chk2[j] = 0;
			}
			
			for(j=i; chk1[j]; j=P[j]){
				K[P[j]] = max(K[P[j]], K[j] - 1);
				chk1[j] = 0;
			}
			
			T.clear();
			
			x = 0;
			
			for(j=i; !chk1[j]; j=P[j]){
				T.push_back(K[j]? 0 : 1);
				if(!K[j]) x ++;
				chk1[j] = 1;
			}
			
			if(x) ans += calc(T);
		}
	}
	
	printf("%d\n", ans);
	
	return 0;
}

Compilation message

link.cpp: In function 'int main()':
link.cpp:67:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &k);
  ~~~~~^~~~~~~~~~~~~~~~
link.cpp:70:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &x, &y);
   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1

72.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	13 ms	12408 KB	Output isn't correct
2	Incorrect	12 ms	12408 KB	Output isn't correct
3	Correct	13 ms	12408 KB	Output is correct
4	Incorrect	14 ms	12536 KB	Output isn't correct
5	Incorrect	18 ms	12664 KB	Output isn't correct
6	Correct	28 ms	14456 KB	Output is correct
7	Correct	38 ms	15220 KB	Output is correct
8	Correct	50 ms	17056 KB	Output is correct
9	Correct	75 ms	22776 KB	Output is correct
10	Correct	70 ms	20724 KB	Output is correct
11	Correct	114 ms	38268 KB	Output is correct
12	Incorrect	148 ms	21412 KB	Output isn't correct
13	Correct	197 ms	32496 KB	Output is correct
14	Correct	244 ms	34028 KB	Output is correct
15	Correct	311 ms	38384 KB	Output is correct
16	Incorrect	382 ms	46084 KB	Output isn't correct
17	Correct	379 ms	41428 KB	Output is correct
18	Incorrect	458 ms	41712 KB	Output isn't correct
19	Correct	463 ms	41872 KB	Output is correct
20	Correct	423 ms	41196 KB	Output is correct
21	Correct	428 ms	46000 KB	Output is correct
22	Correct	438 ms	45868 KB	Output is correct
23	Correct	473 ms	48648 KB	Output is correct
24	Correct	454 ms	45020 KB	Output is correct
25	Correct	442 ms	43756 KB	Output is correct