Submission #136346

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
136346	2019-07-25T07:22:36 Z	임유진(#3261)	Link (CEOI06_link)	C++14	88 / 100	1148 ms	25844 KB

link

#include <bits/stdc++.h>
using namespace std;

const int MAXN = 500005;
const int MAXK = 20005;

int A[MAXN], B[MAXN];
int ed[MAXN], ind[MAXN];
bool chk[MAXN], on[MAXN], cyc[MAXN];
vector<int> cnod[MAXN];
int cn;
queue<int> indz;

void searchgraph(int x) {
	//printf("searchgraph(%d)\n", x);
	chk[x] = on[x] = true;
	if(on[ed[x]]) {
		for(int t = x; !cyc[t]; t = ed[t]) {
			cyc[t] = true;
			cnod[cn].push_back(t);
		}
		cn++;
	}
	else if(!chk[ed[x]]) searchgraph(ed[x]);
	on[x] = false;
}

void movek(int x, int k) {
	for(; k-- >= 0; x = ed[x]) chk[x] = true;
	if(--ind[x] == 0) indz.push(x);
}

int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	int N, K;
	int ans = 0;

	cin >> N >> K;
	for(int i = 0; i < N; i++) cin >> A[i] >> B[i];

	for(int i = 0; i < N; i++) {
		ed[A[i]] = B[i];
		ind[B[i]]++;
	}

	for(int i = 1; i <= N; i++) if(!chk[i]) searchgraph(i);
	//printf("cn = %d\n", cn);
	//for(auto a : cnod[0]) printf("%d ", a);
	//printf("\n");
	for(int i = 1; i <= N; i++) chk[i] = false;
	movek(1, K);
	for(int i = 1; i <= N; i++) if(ind[i] == 0) indz.push(i);
	while(!indz.empty()) {
		if(!chk[indz.front()] && !cyc[indz.front()]) {
			//printf("indz = %d\n", indz.front());
			movek(indz.front(), K - 1);
			ans++;
		}
		indz.pop();
	}
	//for(int i = 1; i <= N; i++) printf("%d ", int(chk[i]));
	//printf("\nans = %d\n", ans);

	for(int i = 0; i < cn; i++) {
		//for(auto a : cnod[i]) printf("%d ", a);
		//printf("\n");
		bool done = true;
		for(auto a : cnod[i]) done &= chk[a];
		if(done) continue;
		if(cnod[i].size() <= K) {
			ans++;
			continue;
		}
		int mn = cnod[i].size();
		for(int j = 0; j <= K; j++) if(j == K - 1 || !chk[cnod[i][j]]) {
			int cnt = 0, t = j;
			while(t < cnod[i].size() + j) {
				while(t < cnod[i].size() + j && chk[cnod[i][t % cnod[i].size()]]) t++;
				if(t == cnod[i].size() + j) break;
				cnt++;
				t += K;
			}
			mn = min(mn, cnt);
		}
		ans += mn;
	}

	cout << ans;
	return 0;
}

Compilation message

link.cpp: In function 'int main()':
link.cpp:70:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(cnod[i].size() <= K) {
      ~~~~~~~~~~~~~~~^~~~
link.cpp:77:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while(t < cnod[i].size() + j) {
          ~~^~~~~~~~~~~~~~~~~~~~
link.cpp:78:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(t < cnod[i].size() + j && chk[cnod[i][t % cnod[i].size()]]) t++;
           ~~^~~~~~~~~~~~~~~~~~~~
link.cpp:79:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(t == cnod[i].size() + j) break;
        ~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1

88.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	13 ms	12152 KB	Output is correct
2	Correct	12 ms	12152 KB	Output is correct
3	Correct	12 ms	12152 KB	Output is correct
4	Correct	14 ms	12280 KB	Output is correct
5	Incorrect	14 ms	12280 KB	Output isn't correct
6	Correct	22 ms	12920 KB	Output is correct
7	Correct	28 ms	13304 KB	Output is correct
8	Correct	33 ms	13816 KB	Output is correct
9	Correct	48 ms	15224 KB	Output is correct
10	Correct	48 ms	14940 KB	Output is correct
11	Correct	72 ms	19720 KB	Output is correct
12	Correct	87 ms	16348 KB	Output is correct
13	Correct	430 ms	18912 KB	Output is correct
14	Correct	120 ms	19704 KB	Output is correct
15	Correct	201 ms	22228 KB	Output is correct
16	Incorrect	157 ms	23416 KB	Output isn't correct
17	Correct	395 ms	24304 KB	Output is correct
18	Correct	189 ms	23668 KB	Output is correct
19	Correct	294 ms	24352 KB	Output is correct
20	Correct	436 ms	24492 KB	Output is correct
21	Incorrect	366 ms	25204 KB	Output isn't correct
22	Correct	579 ms	25456 KB	Output is correct
23	Correct	191 ms	24752 KB	Output is correct
24	Correct	236 ms	25844 KB	Output is correct
25	Correct	1148 ms	25840 KB	Output is correct