oj.uz

Submission #247048

# Submission time Handle Problem Language Result Execution time Memory
247048 2020-07-10T20:14:51 Z opukittpceno_hhr Drzava (COCI15_drzava) C++17
72 / 160
 1000 ms 16372 KB 
#ifndef LOCAL
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#endif
 
#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <string>
#include <cmath>
#include <cstdio>
#include <iomanip>
#include <fstream>
#include <cassert>
#include <cstring>
#include <unordered_set>
#include <unordered_map>
#include <numeric>
#include <ctime>
#include <bitset>
#include <complex>
#include <chrono>
#include <random>
#include <functional>
 
using namespace std;
 
typedef long double ld;
 
typedef long long ll;
 
const int N = 5e4;
const int K = 30;
 
int n, k;
int X[N];
int Y[N];
int C[N];
 
int ids[N];
pair<int, int> block[N];
vector<int> by_block[N];

int block_ind[N];
int bl_ids[N][3][3]; 

int used[N];
 
vector<pair<int, int>> seen;
 
int gt(pair<int, int> v) {
	auto it = lower_bound(seen.begin(), seen.end(), v);
	if (it != seen.end() && *it == v) {
		return (int)(it - seen.begin());
	}
	return (int)-1;
};
 
int hv[N];

void dfs(int i, int &pnt, ll mid_int) {
	hv[pnt++] = C[i];
	used[i] = 1;
	int we = block_ind[i];
	for (int dx = -1; dx <= 1; dx++) {
		for (int dy = -1; dy <= 1; dy++) {
			int bl_id = bl_ids[we][dx + 1][dy + 1];
			if (bl_id == -1) continue;
			for (auto other : by_block[bl_id]) {
				if (!used[other] && (ll)(X[i] - X[other]) * (X[i] - X[other]) + (ll)(Y[i] - Y[other]) * (Y[i] - Y[other]) <= mid_int) {
					dfs(other, pnt, mid_int);
				}
			}
		}
	}
}
 
int dp[N][K];
 
bool solve(int pnt) {
	for (int i = 0; i <= pnt; i++) {
		for (int j = 0; j < k; j++) {
			dp[i][j] = -N;
		}
	}
	dp[0][0] = 0;
	for (int i = 0; i < pnt; i++) {
		for (int j = 0; j < k; j++) {
			if (dp[i][j] == -N) continue;
			dp[i + 1][(j + hv[i]) % k] = max(dp[i + 1][(j + hv[i]) % k], dp[i][j] + 1); 
			dp[i + 1][j] = max(dp[i + 1][j], dp[i][j]);
		}
		if (dp[i + 1][0]) return true;
	}
	return false;
}

bool check(ll mid_int) {
	{
		ld mid = sqrt((ld)mid_int) / 2;
		for (int i = 0; i < n; i++) {
			by_block[i].clear();
			ids[i] = i;
		}
		seen.clear();
		for (int i = 0; i < n; i++) {
			ids[i] = i;
			block[i] = {X[i] / mid, Y[i] / mid};
			seen.push_back(block[i]);
		}
		sort(ids, ids + n, [&](int i, int j) {
			return block[i] < block[j];
		});
		for (int i = 0; i < n; i++) {
			int r = i;
			while (r + 1 < n && block[ids[r]] == block[ids[r + 1]]) {
				r++;
			}
			if (r - i + 1 >= k) {
				return true;
			}
			i = r;
		}	
	}
	{
		ld mid = sqrt((ld)mid_int);
		for (int i = 0; i < n; i++) {
			by_block[i].clear();
			ids[i] = i;
		}
		seen.clear();
		for (int i = 0; i < n; i++) {
			ids[i] = i;
			block[i] = {X[i] / mid, Y[i] / mid};
			seen.push_back(block[i]);
		}
		sort(ids, ids + n, [&](int i, int j) {
			return block[i] < block[j];
		});
	}
	{
		int c = 0;
		for (int i = 0; i < n; i++) {
			if (i > 0) c += (block[ids[i - 1]] < block[ids[i]]);
			block_ind[ids[i]] = c;
		}
	}
	sort(seen.begin(), seen.end());
	seen.resize(unique(seen.begin(), seen.end()) - seen.begin());
	for (int i = 0; i < (int)seen.size(); i++) {
		for (int dx = -1; dx <= 1; dx++) {
			for (int dy = -1; dy <= 1; dy++) {
				bl_ids[i][dx + 1][dy + 1] = gt({seen[i].first + dx, seen[i].second + dy});
			}
		}
	}
	for (int i = 0; i < n; i++) {
		by_block[gt(block[i])].push_back(i);
	}
	int ans = 0;
	fill(used, used + n, 0);
	for (int i = 0; i < n; i++) {
		if (!used[i]) {
			int pnt  = 0;
			dfs(i, pnt, mid_int);
			if (solve(pnt)) return true;
		}
	}
	return false;
}
 
signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	
	cin >> n >> k;
	for (int i = 0; i < n; i++) {
		cin >> X[i] >> Y[i] >> C[i];
	}
	ll l = 0;
	ll r = 4e18 + 239;
	while (r - l > 1) {
		ll m = (r + l) >> 1;
		if (check(m)) {
			r = m;
		} else {
			l = m;
		}
	}
	cout << fixed << setprecision(3);
	cout << sqrt(r) << endl;
}

Compilation message

drzava.cpp: In function 'bool check(ll)':
drzava.cpp:163:6: warning: unused variable 'ans' [-Wunused-variable]
  int ans = 0;
      ^~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Correct 6 ms 1536 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Correct 6 ms 1536 KB Output is correct

Subtask #3
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Correct 18 ms 1792 KB Output is correct

Subtask #4
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Correct 22 ms 1792 KB Output is correct

Subtask #5
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Correct 15 ms 1792 KB Output is correct

Subtask #6
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 1536 KB Output is correct
2 Correct 18 ms 1920 KB Output is correct

Subtask #7
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Correct 19 ms 1792 KB Output is correct

Subtask #8
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Correct 22 ms 1664 KB Output is correct

Subtask #9
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 1536 KB Output is correct
2 Correct 486 ms 3880 KB Output is correct

Subtask #10
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Execution timed out 1095 ms 15864 KB Time limit exceeded

Subtask #11
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Execution timed out 1094 ms 15604 KB Time limit exceeded

Subtask #12
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Execution timed out 1093 ms 15220 KB Time limit exceeded

Subtask #13
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 1536 KB Output is correct
2 Execution timed out 1091 ms 16204 KB Time limit exceeded

Subtask #14
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Execution timed out 1086 ms 16372 KB Time limit exceeded

Subtask #15
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Execution timed out 1089 ms 14936 KB Time limit exceeded

Subtask #16
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Execution timed out 1097 ms 15856 KB Time limit exceeded

Subtask #17
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Execution timed out 1049 ms 10760 KB Time limit exceeded

Subtask #18
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 1536 KB Output is correct
2 Execution timed out 1051 ms 10868 KB Time limit exceeded

Subtask #19
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Execution timed out 1088 ms 15832 KB Time limit exceeded

Subtask #20
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1536 KB Output is correct
2 Execution timed out 1093 ms 8280 KB Time limit exceeded