Submission #389802

#	Time	Username	Problem	Language	Result	Execution time	Memory
389802		milleniumEeee	Palembang Bridges (APIO15_bridge)	C++14	31 / 100	2073 ms	5724 KiB

bridge

#include <bits/stdc++.h>
#define fr first
#define sc second
#define pii pair<int, int>
#define pb push_back
#define szof(s) (int)s.size()
#define all(s) s.begin(), s.end()
#define fastInp ios_base::sync_with_stdio(0); cin.tie(0);
#define int long long
using namespace std;

const int MAXN = (int)2e5 + 5;
const int INF = 1e18;

pair <char, int> st[MAXN];
pair <char, int> fn[MAXN];

bool ok(int pos) {
	return (st[pos].first == fn[pos].first);	
}

signed main() {
	fastInp;
	int n, k;
	cin >> k >> n;
	for (int i = 1; i <= n; i++) {
		cin >> st[i].fr >> st[i].sc >> fn[i].fr >> fn[i].sc;
	}
	if (k == 1) {
		int side = 0;
		int bridge = 0;
		vector <int> x;
		for (int i = 1; i <= n; i++) {
			if (ok(i)) {
				side += abs(st[i].sc - fn[i].sc);
			} else {
				x.pb(st[i].sc);
				x.pb(fn[i].sc);
			}
		}
		sort(all(x));
		int opt = x[szof(x) / 2 - 1];
		for (int el : x) {
			bridge += abs(opt - el);
		}
		cout << side + szof(x) / 2 + bridge << endl;
	}
	else if (k == 2) {
		int ans = INF;
		vector <int> vec;
		for (int i = 1; i <= n; i++) {
			vec.pb(st[i].sc);
			vec.pb(fn[i].sc);
		}
		int bb1, bb2;
		for (int b1 : vec) {
			for (int b2 : vec) {
				int cur = 0;
				for (int p = 1; p <= n; p++) {
					if (ok(p)) {
						cur += abs(st[p].sc - fn[p].sc);
					} else {
						int x = st[p].sc;
						int y = fn[p].sc;
						cur += 1 + min(abs(x - b1) + abs(y - b1), abs(x - b2) + abs(y - b2));
					}
				}
				if (ans > cur) {
					ans = cur;
					bb1 = b1;
					bb2 = b2;
				}
			}
		}
		cout << ans << endl;
		//cout << "ans: " << ans << endl;
		//cout << "b1: " << bb1 << endl;
		//cout << "b2: " << bb2 << endl;
	}
}

/*
2 5
B 0 A 4
B 1 B 3
A 5 B 7
B 2 A 6
B 1 A 7
*/

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:55:7: warning: variable 'bb1' set but not used [-Wunused-but-set-variable]
   55 |   int bb1, bb2;
      |       ^~~
bridge.cpp:55:12: warning: variable 'bb2' set but not used [-Wunused-but-set-variable]
   55 |   int bb1, bb2;
      |            ^~~

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