Submission #797498

#	Time	Username	Problem	Language	Result	Execution time	Memory
797498		acatmeowmeow	Palembang Bridges (APIO15_bridge)	C++11	22 / 100	31 ms	4248 KiB

bridge

#include <bits/stdc++.h>

using namespace std;

#define int long long 

const int N = 1e5;
int k, n, s[N + 5], t[N + 5];
char p[N + 5], q[N + 5];

namespace sub2 {

	int main(int n, int k, int s[], int t[], char p[], char q[]) {
		vector<int> arr;
		int init = 0;
		for (int i = 1; i <= n; i++) {
			if (p[i] == q[i]) init += abs(s[i] - t[i]);
			else arr.push_back(s[i]), arr.push_back(t[i]), init++;
		}
		sort(arr.begin(), arr.end());
		int ans = 0, mid = arr.size()/2;
		for (auto&v : arr) ans += abs(v - arr[mid]);
		return init + ans;
	}
}

namespace sub5 {

	void balance(multiset<int>&f, multiset<int>&se, int&fSum, int&seSum) {
		if (f.size() < se.size()) f.insert(*se.begin()), fSum += *se.begin(), seSum -= *se.begin(), se.erase(se.find(*se.begin()));
		else if (f.size() > se.size() + 1) se.insert(*f.rbegin()), seSum += *f.rbegin(), fSum -= *f.rbegin(), f.erase(f.find(*f.rbegin()));
	}

	int compute(multiset<int>&f, multiset<int>&se, int&fSum, int&seSum) {
		if(f.empty()) return 1e9;
		int median = *f.rbegin(), fSz = f.size(), seSz = se.size();
		return median*fSz - fSum + seSum - seSz*median;
	}

	void add(multiset<int>&f, multiset<int>&se, int&fSum, int&seSum, int v) {
		if (v <= *f.rbegin() || f.empty()) f.insert(v), fSum += v;
		else se.insert(v), seSum += v;
		balance(f, se, fSum, seSum);
	}

	void remove(multiset<int>&f, multiset<int>&se, int&fSum, int&seSum, int v) {
		if (f.find(v) != f.end()) f.erase(f.find(v)), fSum -= v;
		else se.erase(se.find(v)), seSum -= v;
		balance(f, se, fSum, seSum);
	}

	int main(int n, int k, int s[], int t[], char p[], char q[]) {
		vector<int> arr;
		int init = 0;
		for (int i = 1; i <= n; i++){
			if (p[i] == q[i]) init += abs(s[i] - t[i]);
			else arr.push_back(i), init++;
		}
		sort(arr.begin(), arr.end(), [&](int a, int b) { return s[a] + t[a] < s[b] + t[b]; });
		multiset<int> f, se, thi, four;
		int fSum = 0, seSum = 0, thiSum = 0, fourSum = 0;
		for (int i = 0; i < arr.size(); i++) {
			add(thi, four, thiSum, fourSum, s[arr[i]]);
			add(thi, four, thiSum, fourSum, t[arr[i]]);
		}	
		int ans = compute(thi, four, thiSum, fourSum);
		for (int i = 0; i < arr.size(); i++) {
			remove(thi, four, thiSum, fourSum, s[arr[i]]);
			remove(thi, four, thiSum, fourSum, t[arr[i]]);
			add(f, se, fSum, seSum, s[arr[i]]);
			add(f, se, fSum, seSum, t[arr[i]]);
			ans = min(ans, compute(f, se, fSum, seSum) + compute(thi, four, thiSum, fourSum));
		}
		return init + ans;	
	}
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cin >> k >> n;
	for (int i = 1; i <= n; i++) cin >> p[i] >> s[i] >> q[i] >> t[i];
	int ans = sub2::main(n, k, s, t, p, q);
	if (k == 2) ans = min(ans, sub5::main(n, k, s, t, p, q));
	cout << ans << '\n';
	return 0;
}

Compilation message (stderr)

bridge.cpp: In function 'long long int sub5::main(long long int, long long int, long long int*, long long int*, char*, char*)':
bridge.cpp:62:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |   for (int i = 0; i < arr.size(); i++) {
      |                   ~~^~~~~~~~~~~~
bridge.cpp:67:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |   for (int i = 0; i < arr.size(); i++) {
      |                   ~~^~~~~~~~~~~~

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