Submission #136305

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
136305	2019-07-25T06:08:34 Z	임유진(#3261)	Link (CEOI06_link)	C++14	88 / 100	1182 ms	25784 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	12 ms	12152 KB	Output is correct
2	Correct	12 ms	12152 KB	Output is correct
3	Correct	13 ms	12120 KB	Output is correct
4	Correct	13 ms	12220 KB	Output is correct
5	Incorrect	13 ms	12164 KB	Output isn't correct
6	Correct	22 ms	12920 KB	Output is correct
7	Correct	26 ms	13304 KB	Output is correct
8	Correct	34 ms	13928 KB	Output is correct
9	Correct	44 ms	15224 KB	Output is correct
10	Correct	44 ms	14972 KB	Output is correct
11	Correct	69 ms	19576 KB	Output is correct
12	Correct	88 ms	16408 KB	Output is correct
13	Correct	296 ms	18808 KB	Output is correct
14	Correct	118 ms	19704 KB	Output is correct
15	Correct	204 ms	22384 KB	Output is correct
16	Incorrect	171 ms	23416 KB	Output isn't correct
17	Correct	440 ms	24304 KB	Output is correct
18	Correct	194 ms	23732 KB	Output is correct
19	Correct	335 ms	24308 KB	Output is correct
20	Correct	419 ms	24540 KB	Output is correct
21	Incorrect	365 ms	25204 KB	Output isn't correct
22	Correct	572 ms	25328 KB	Output is correct
23	Correct	190 ms	24696 KB	Output is correct
24	Correct	263 ms	25784 KB	Output is correct
25	Correct	1182 ms	25764 KB	Output is correct