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Submission #109967

# Submission time Handle Problem Language Result Execution time Memory
109967 2019-05-08T13:22:55 Z Saboon Palembang Bridges (APIO15_bridge) C++14
63 / 100
 104 ms 4080 KB 
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

const int maxn = 1e5 + 10;
const ll inf = 1e18;

vector<pair<int, int> > eve;
vector<ll> places;
ll Answer = inf;

ll calculate(int i, int j){
	ll sum = 0;
	for (auto k : eve){
		ll tmp = min(abs(k.first - places[i]) + abs(k.second - places[i]),
				abs(k.first - places[j]) + abs(k.second - places[j]));
		sum += tmp;
	}
	return sum;
}

void find(int L, int R, int l, int r){
	if (L >= R)
		return;
	int mid = (L + R) >> 1;
	ll k = inf, idx = -1;
	for (int i = l; i < min(mid, r); i++){
		ll tmp = calculate(i, mid);
		if (tmp < k){
			k = tmp;
			idx = i;
		}
	}
	Answer = min(Answer, k);
	find(L, mid, l, idx + 1);
	find(mid + 1, R, idx, r);
}

ll solve(){
	int n = eve.size();
	vector<ll> a(2 * n + 1);
	for (int i = 0; i < n; i++){
		a[2 * i + 0 + 1] = eve[i].first;
		a[2 * i + 1 + 1] = eve[i].second;
	}
	sort(a.begin() + 1, a.end());
	n = 2 * n;
	for (int i = 1; i <= n; i++)
		a[i] += a[i - 1];
	ll answer = inf;
	for (int i = 1; i <= n; i++){
		ll T = a[i] - a[i - 1];
		answer = min(answer, T * (i - (n - i)) - a[i] + (a[n] - a[i])); 
	}
	return answer + eve.size();
}

int main(){
	ios_base::sync_with_stdio(false);
	int k, n;
	cin >> k >> n;
	ll answer = 0;
	for (int i = 0; i < n; i++){
		int x, y;
		char a, b;
		cin >> a >> x >> b >> y;
		if (a == b){
			answer += abs(x - y);
			continue;
		}
		if (a == 'B')
			swap(x, y);
		eve.push_back({x, y});
	}
	if (eve.empty())
		return cout << answer << endl, 0;
	if (k == 1){
		cout << answer + solve() << '\n';
		return 0;
	}
	for (int i = 0; i < eve.size(); i++){
		places.push_back(eve[i].first);
		places.push_back(eve[i].second);
	}
	sort(places.begin(), places.end());
/*	if (n <= 1){
		int m = places.size();
		ll tot = inf;
		for (int i = 0; i < m; i++){
			for (int j = i + 1; j < m; j++){
				ll sum = 0;
				sum = calculate(i, j);
				tot = min(tot, sum + answer + m / 2);
			}
		}
		return cout << tot << endl, 0;
	}
*/	if (n <= 1000){
		int m = places.size();
		find(0, m, 0, m);
		cout << Answer + answer + eve.size() << endl;
		return 0;
	}
}

Compilation message

bridge.cpp: In function 'int main()':
bridge.cpp:82:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < eve.size(); i++){
                  ~~^~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 3 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 3 ms 384 KB Output is correct
6 Correct 3 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 3 ms 384 KB Output is correct
11 Correct 3 ms 384 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 3 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 3 ms 384 KB Output is correct
5 Correct 3 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 3 ms 356 KB Output is correct
12 Correct 29 ms 2800 KB Output is correct
13 Correct 51 ms 2772 KB Output is correct
14 Correct 52 ms 2540 KB Output is correct
15 Correct 36 ms 1908 KB Output is correct
16 Correct 39 ms 2920 KB Output is correct
17 Correct 51 ms 2924 KB Output is correct
18 Correct 52 ms 2796 KB Output is correct
19 Correct 51 ms 2800 KB Output is correct
20 Correct 35 ms 2800 KB Output is correct
21 Correct 59 ms 2800 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 384 KB Output is correct
2 Correct 3 ms 384 KB Output is correct
3 Correct 3 ms 384 KB Output is correct
4 Correct 3 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 3 ms 384 KB Output is correct
11 Correct 3 ms 384 KB Output is correct
12 Correct 3 ms 384 KB Output is correct

Subtask #4
32.0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 3 ms 384 KB Output is correct
4 Correct 4 ms 320 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 3 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 6 ms 384 KB Output is correct
11 Correct 3 ms 384 KB Output is correct
12 Correct 3 ms 384 KB Output is correct
13 Correct 72 ms 384 KB Output is correct
14 Correct 90 ms 436 KB Output is correct
15 Correct 70 ms 440 KB Output is correct
16 Correct 9 ms 384 KB Output is correct
17 Correct 22 ms 384 KB Output is correct
18 Correct 12 ms 384 KB Output is correct
19 Correct 71 ms 384 KB Output is correct
20 Correct 75 ms 504 KB Output is correct
21 Correct 65 ms 384 KB Output is correct
22 Correct 74 ms 504 KB Output is correct
23 Correct 71 ms 384 KB Output is correct
24 Correct 73 ms 384 KB Output is correct

Subtask #5
0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 3 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 3 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 3 ms 384 KB Output is correct
11 Correct 3 ms 384 KB Output is correct
12 Correct 3 ms 384 KB Output is correct
13 Correct 61 ms 508 KB Output is correct
14 Correct 67 ms 508 KB Output is correct
15 Correct 73 ms 504 KB Output is correct
16 Correct 10 ms 384 KB Output is correct
17 Correct 22 ms 384 KB Output is correct
18 Correct 15 ms 384 KB Output is correct
19 Correct 104 ms 504 KB Output is correct
20 Correct 89 ms 476 KB Output is correct
21 Correct 93 ms 436 KB Output is correct
22 Correct 73 ms 384 KB Output is correct
23 Correct 75 ms 384 KB Output is correct
24 Correct 77 ms 476 KB Output is correct
25 Incorrect 31 ms 4080 KB Output isn't correct
26 Halted 0 ms 0 KB -