Submission #35269

#	Time	Username	Problem	Language	Result	Execution time	Memory
35269		cheater2k	Palembang Bridges (APIO15_bridge)	C++14	22 / 100	49 ms	4536 KiB

bridge

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

const int N = 100005;

int k, n;
int sz;
long long ans;
pair<int,int> a[N];
vector<int> z;

long long solve1() {
	if (n == 0) return 0;
	long long res = 0;
	int med = z[z.size() / 2];
	for (int i = 0; i < z.size(); ++i) {
		res += abs(med - z[i]);
	}
	return res;
}

long long calc(int x, int y) {
	long long res = 0;
	for (int i = 1; i <= n; ++i) {
		int dx = abs(x - a[i].first) + abs(x - a[i].second);
		int dy = abs(y - a[i].first) + abs(y - a[i].second);
		res += min(dx, dy);
	}
	return res;
}

long long solve2() {
	if (n == 0) return 0;
	int pt = 1;
	long long res = 1e18;
	for (int i = 0; i < z.size() - 1; ++i) {
		if (pt <= i) pt = i + 1;
		while(pt < (int)z.size() - 1 && calc(z[i], z[pt]) > calc(z[i], z[pt + 1])) ++pt;
		res = min(res, calc(z[i], z[pt]));
	}
	return res;
}

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0);
	cin >> k >> n;
	for (int i = 1; i <= n; ++i) {
		char p, q;
		int s, t;
		cin >> p >> s >> q >> t;
		if (p == q) ans += abs(s - t);
		else ++sz, a[sz] = make_pair(min(s, t), max(s, t));
	}
	n = sz;
	for (int i = 1; i <= n; ++i) {
		z.push_back(a[i].first);
		z.push_back(a[i].second);
	}
	sort(z.begin(), z.end());

	ans += n;
	if (k == 1) ans += solve1(); else ans += min(solve1(), solve2());

	printf("%lld\n", ans);
}

Compilation message (stderr)

bridge.cpp: In function 'long long int solve1()':
bridge.cpp:16:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < z.size(); ++i) {
                    ^
bridge.cpp: In function 'long long int solve2()':
bridge.cpp:36:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < z.size() - 1; ++i) {
                    ^

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 0 / 9
• Subtask 4: 0 / 32
• Subtask 5: 0 / 37