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Submission #151186

# Submission time Handle Problem Language Result Execution time Memory
151186 2019-09-02T04:45:30 Z imyujin Trip to the Galapagos Islands (FXCUP4_island) C++17
31 / 100
 5000 ms 24352 KB 
#include "island.h"
#include <bits/stdc++.h>
using namespace std;

typedef pair<int, int> pii;

#define eb emplace_back
#define allv(v) ((v).begin()),((v).end())

const int SQRTN = 300;
const int MAXN = 100010;
const int MAXM = 300010;
const int MX = 1 << 17;

int N, M;
vector<int> node[MAXN], ed[MAXN];
int uni[MAXN];
vector<int> idx[MAXN];
int mem[SQRTN][MAXN];
int bigidx[MAXN];
int seg[2 * MX];

int guni(int x) { return x == uni[x] ? x : guni(uni[x]); }

void mkseg(int idx, int l, int r) {
	if(l == r) seg[idx] = ed[0][l];
	else {
		int m = (l + r) / 2;
		mkseg(idx * 2, l, m);
		mkseg(idx * 2 + 1, m + 1, r);
		seg[idx] = min(seg[idx * 2], seg[idx * 2 + 1]);
	}
}

int gseg(int idx, int l, int r, int x, int y) {
	if(x <= l && r <= y) return seg[idx];
	else if(r < x || y < l) return M;
	int m = (l + r) / 2;
	return min(gseg(idx * 2, l, m, x, y), gseg(idx * 2 + 1, m + 1, r, x, y));
}
int gseg(int x, int y) { return gseg(1, 0, N - 2, x, y); }

void Init(int K, vector<int> F, vector<int> S, vector<int> E){
	N = F.size();
	M = S.size();
	for(int i = 0; i < N; i++) {
		uni[i] = i;
		node[i].eb(i);
	}

	for(int i = M - 1; i >= 0; i--) {
		S[i] = guni(S[i]);
		E[i] = guni(E[i]);
		if(S[i] == E[i]) continue;
		if(node[S[i]].size() < node[E[i]].size()) swap(S[i], E[i]);
		node[S[i]].insert(node[S[i]].end(), allv(node[E[i]]));
		ed[S[i]].eb(i);
		ed[S[i]].insert(ed[S[i]].end(), allv(ed[E[i]]));
		uni[E[i]] = S[i];
	}
	for(int i = 0; i < N; i++) if(i == uni[i]) {
		node[0] = node[i];
		ed[0] = ed[i];
	}
	for(int i = 0; i < N; i++) idx[F[node[0][i]]].eb(i);
	mkseg(1, 0, N - 2);

	int cnt = 0;
	for(int i = 0; i < K; i++) {
		if(idx[i].size() > SQRTN) {
			bigidx[i] = cnt++;
			int mn = M;
			for(int j = idx[i][0] + 1; j < N; j++) {
				mn = min(mn, ed[0][j - 1]);
				if(F[node[0][j]] == i) mn = M;
				else mem[bigidx[i]][F[node[0][j]]] = max(mem[bigidx[i]][F[node[0][j]]], mn);
			}
			mn = M;
			for(int j = idx[i].back() - 1; j >= 0; j--) {
				mn = min(mn, ed[0][j]);
				if(F[node[0][j]] == i) mn = M;
				else mem[bigidx[i]][F[node[0][j]]] = max(mem[bigidx[i]][F[node[0][j]]], mn);
			}
		}
		else bigidx[i] = -1;
	}
}

int Separate(int A, int B){
	if(bigidx[A] != -1) return mem[bigidx[A]][B] + 1;
	if(bigidx[B] != -1) return mem[bigidx[B]][A] + 1;

	int ans = 0;
	int pa = 0, pb = 0;
	while(pa < idx[A].size() && pb < idx[B].size()) {
		if(idx[A][pa] < idx[B][pb]) {
			ans = max(ans, gseg(idx[A][pa], idx[B][pb] - 1));
			pa++;
		}
		else {
			ans = max(ans, gseg(idx[B][pb], idx[A][pa] - 1));
			pb++;
		}
	}
	return ans + 1;
}

Compilation message

island.cpp: In function 'int Separate(int, int)':
island.cpp:95:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(pa < idx[A].size() && pb < idx[B].size()) {
        ~~~^~~~~~~~~~~~~~~
island.cpp:95:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(pa < idx[A].size() && pb < idx[B].size()) {
                              ~~~^~~~~~~~~~~~~~~

Subtask #1
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 241 ms 23904 KB Output is correct
2 Correct 236 ms 24032 KB Output is correct
3 Correct 239 ms 24288 KB Output is correct
4 Correct 236 ms 24224 KB Output is correct
5 Correct 244 ms 24228 KB Output is correct
6 Correct 269 ms 23904 KB Output is correct
7 Correct 255 ms 24352 KB Output is correct
8 Correct 233 ms 24036 KB Output is correct
9 Correct 248 ms 24288 KB Output is correct
10 Correct 272 ms 24036 KB Output is correct

Subtask #2
0 / 39.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 7416 KB Output is correct
2 Correct 8 ms 7388 KB Output is correct
3 Correct 183 ms 21216 KB Output is correct
4 Correct 207 ms 21440 KB Output is correct
5 Correct 307 ms 21440 KB Output is correct
6 Correct 346 ms 21308 KB Output is correct
7 Correct 541 ms 21512 KB Output is correct
8 Correct 988 ms 22372 KB Output is correct
9 Execution timed out 5062 ms 21116 KB Time limit exceeded
10 Halted 0 ms 0 KB -

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 7416 KB Output is correct
2 Correct 8 ms 7388 KB Output is correct
3 Correct 241 ms 23904 KB Output is correct
4 Correct 236 ms 24032 KB Output is correct
5 Correct 239 ms 24288 KB Output is correct
6 Correct 236 ms 24224 KB Output is correct
7 Correct 244 ms 24228 KB Output is correct
8 Correct 269 ms 23904 KB Output is correct
9 Correct 255 ms 24352 KB Output is correct
10 Correct 233 ms 24036 KB Output is correct
11 Correct 248 ms 24288 KB Output is correct
12 Correct 272 ms 24036 KB Output is correct
13 Correct 183 ms 21216 KB Output is correct
14 Correct 207 ms 21440 KB Output is correct
15 Correct 307 ms 21440 KB Output is correct
16 Correct 346 ms 21308 KB Output is correct
17 Correct 541 ms 21512 KB Output is correct
18 Correct 988 ms 22372 KB Output is correct
19 Execution timed out 5062 ms 21116 KB Time limit exceeded
20 Halted 0 ms 0 KB -