Submission #1069725

#	Time	Username	Problem	Language	Result	Execution time	Memory
1069725		Muhammet	Palembang Bridges (APIO15_bridge)	C++17	0 / 100	1 ms	2396 KiB

bridge

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

#define ll long long
#define sz(x) (int)x.size()
#define ff first
#define ss second

const int N = 300005;
const int M = 1e9 + 7;

int T, n, k, s1[N], s2[N];

char c1[N], c2[N];

vector <int> p, f;

int f1(int x){
	int p1 = (lower_bound(p.begin(),p.end(), x) - p.begin() - 1), f1 = (upper_bound(f.begin(), f.end(), x) - f.begin());
	int y = 0;
	if(p1 >= 0) y += p[p1];
	if(f1 < sz(f)) y += f[f1];
	return y;
}

signed main(){
	ios::sync_with_stdio(false); cin.tie(0);

	cin >> k >> n;
	int ans = 0;
	for(int i = 1; i <= n; i++){
		cin >> c1[i] >> s1[i] >> c2[i] >> s2[i];
	}
	if(k == 1){
		int ans1 = 0;
		vector <pair <int,int>> v;
		for(int i = 1; i <= n; i++){
			ans1 += abs(s1[i]-s2[i]);
			if(c1 != c2) {
				v.push_back({min(s1[i],s2[i]),max(s1[i],s2[i])});
			}
		}
		sort(v.begin(), v.end());
		ans1 += sz(v);
		vector <int> df, ds;
		p.assign(sz(v),0);
		f.assign(sz(v),0);
		for(int i = 0; i < sz(v); i++){
			df.push_back(v[i].ff);
			ds.push_back(v[i].ss);
		}
		sort(ds.begin(), ds.end());
		int x = 0;
		for(int i = 0; i < sz(v)-1; i++){
			x += (ds[i+1]-ds[i]) * (i+1);
			p[i] = x;
		}
		x = 0;
		int cnt = 0;
		for(int i = sz(v)-1; i > 0; i--){
			cnt++;
			x += (df[i]-df[i-1]) * cnt;
			f[i] = x;
		}

		int mn = 1e9;
		for(int i = 0; i < sz(v); i++){
			mn = min(f1(df[i]),mn);
			mn = min(f1(ds[i]),mn);
		}
		// cout << mn + ans1 << '\n';
        cout << mn + ans1 << "\n";
        return 0;
	}
	cout << -1;

	return 0;
}

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:30:6: warning: unused variable 'ans' [-Wunused-variable]
   30 |  int ans = 0;
      |      ^~~

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