Submission #882575

#	Time	Username	Problem	Language	Result	Execution time	Memory
882575		vjudge1	Palembang Bridges (APIO15_bridge)	C++17	0 / 100	0 ms	348 KiB

bridge

#include <bits/stdc++.h>
#define fast cin.tie(0)->sync_with_stdio(0);
#define int long long
#define inf ((int)1e18)
using namespace std;

int solve(vector<pair<int,int> > v, int st, int nd) {
	if(st == nd) return 0;
	vector <int> p;
	int ans = 0;
	for(int i = st; i < nd; i++) {
		int a = v[i].first, b = v[i].second;
		p.push_back(a);
		p.push_back(b);
	}
	sort(p.begin(), p.end());
	int bridge = p[p.size() / 2];
	for(auto it:p) {
		ans += abs(bridge-it);
	}
	return ans;
}

int32_t main(){
	fast
	int k,n;
	cin >> k >> n;
	vector <pair<int, int> > p;
	int add_ans = 0;
	for(int i = 0; i < n; i++) {
		char fuck1, fuck2;
		int a, b;
		cin >> fuck1 >> a >> fuck2 >> b;
		if(fuck1 == fuck2) {
			add_ans += abs(a - b);
		}
		else {
			add_ans += 1;
			p.push_back({min(a, b), max(a, b)});
		}
	}
	sort(p.begin(), p.end(), [&](pair<int,int>a, pair<int,int>b) {
		return (a.first + a.second) / 2 < (b.first + b.second) / 2;
	});
	int m = p.size();
	int ans = inf;
	for(int i = 0; i < m; i++) {
		int st = p[i].first;
		int tans = solve(p, i, m) + solve(p, 0, i);
		ans = min(ans, tans);
	}
	cout << ans + add_ans << "\n";
}

Compilation message (stderr)

bridge.cpp: In function 'int32_t main()':
bridge.cpp:48:7: warning: unused variable 'st' [-Wunused-variable]
   48 |   int st = p[i].first;
      |       ^~

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