Submission #168862

#	Time	Username	Problem	Language	Result	Execution time	Memory
168862		Mamnoon_Siam	Cipele (COCI18_cipele)	C++17	90 / 90	629 ms	5000 KiB

cipele

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

using ll = long long;
using ii = pair<int, int>;

const int maxn = 1e5 + 5;

int n, m;
int a[maxn], b[maxn];
int par[maxn];
int find(int u) {
	return par[u] == u ? u : par[u] = find(par[u]);
}

bool can(int del) {
	vector<ii> v;
	for(int i = 1; i <= n; i++) {
		int l = lower_bound(b + 1, b + 1 + m, a[i] - del) - b;
		int r = upper_bound(b + 1, b + 1 + m, a[i] + del) - b - 1;
		if(l > r) return 0;
		v.emplace_back(l, r);
	}
	sort(v.begin(), v.end());
	iota(par, par + 1 + m + 1, 0);
	for(ii el : v) {
		int l = el.first, r = el.second;
		int mn = find(l);
		if(mn > r) {
			return 0;
		} else {
			par[mn] = mn + 1;
		}
	}
	return 1;
}

int main(int argc, char const *argv[])
{
#ifdef LOCAL
	freopen("in", "r", stdin);
#endif
	cin >> n >> m;
	if(n <= m) {
		for(int i = 1; i <= n; i++) {
			cin >> a[i];
		}
		for(int i = 1; i <= m; i++) {
			cin >> b[i];
		}
	} else {
		for(int i = 1; i <= n; i++) {
			cin >> b[i];
		}
		for(int i = 1; i <= m; i++) {
			cin >> a[i];
		}
		swap(n, m);
	}
	sort(a + 1, a + 1 + n);
	sort(b + 1, b + 1 + m);
	int lo = 0, hi = 1e9, opt = -1, mid;
	while(lo <= hi) {
		mid = lo + hi >> 1;
		if(can(mid)) {
			opt = mid;
			hi = mid - 1;
		} else {
			lo = mid + 1;
		}
	}
	cout << opt << endl;
	return 0;
}

Compilation message (stderr)

cipele.cpp: In function 'int main(int, const char**)':
cipele.cpp:64:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   mid = lo + hi >> 1;
         ~~~^~~~

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 9 / 9
• Subtask 6: 9 / 9
• Subtask 7: 9 / 9
• Subtask 8: 9 / 9
• Subtask 9: 9 / 9
• Subtask 10: 9 / 9