oj.uz

Submission #710707

# Submission time Handle Problem Language Result Execution time Memory
710707 2023-03-15T16:11:35 Z aVe Papričice (COCI20_papricice) C++14
110 / 110
 222 ms 22480 KB 
#include <bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define vi vector<int>
#define vl vector<ll>
#define mp make_pair
#define pb push_back
#define se second
#define fi first
using namespace std;
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif
clock_t startTime;
double getCurrentTime() {
	return (double)(clock() - startTime) / CLOCKS_PER_SEC;
}
ll set_on(ll n, ll k){
	return (n |= 1 << k);
}
ll set_off(ll n, ll k){
	return (n &= ~(1UL << k));
}
bool check_bit(ll n, ll k){
	int bit = (n >> k) & 1U;
	if(bit == 1)
		return true;
	return false;
}
int n, ans = 1e9;
vi G[200100], sz;
void dfs(int at, int prev){
	sz[at] = 1;
	for(auto next : G[at]){
		if(next == prev)	continue;
		dfs(next, at);
		sz[at] += sz[next];
	}
}
set<int> A, B;
int opt(int a, int b, int c){
	return max({a, b, c}) - min({a, b, c});
}
vi close(set<int>&s, int x){
	vi v;
	auto it = s.lower_bound(x);
	if(it != s.end())v.pb(*it);
	if(it != s.begin()){
		--it;
		v.pb(*it);
	}
	return v;
}
void dfs2(int at, int prev){
	for(int szA : close(A, (n + sz[at]) / 2))
		ans = min(ans, opt(sz[at], szA - sz[at], n - szA));
	for(int szB : close(B, (n - sz[at]) / 2))
		ans = min(ans, opt(sz[at], szB, n - sz[at] - szB));
		
	A.insert(sz[at]);
	for(auto next : G[at])
		if(next != prev)
			dfs2(next, at);
			
	A.erase(sz[at]);
	B.insert(sz[at]);
}
void solve(){
	cin>>n;
	sz.resize(n);
	vector<pii> edge;
	for(int i = 1; i < n; i++){
		int a, b;
		cin>>a>>b;
		a--; b--;
		G[a].pb(b);
		G[b].pb(a);
	}
	dfs(0, -1);
	dfs2(0, -1);
	cout<<ans<<endl;
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.precision(10);
	cout<<fixed;
	startTime = clock();
	int t=1;
//	cin>>t;
	while(t--)
		solve();

	return 0;
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 5076 KB Output is correct
7 Correct 4 ms 5020 KB Output is correct
8 Correct 4 ms 5076 KB Output is correct
9 Correct 4 ms 5076 KB Output is correct
10 Correct 5 ms 5100 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 5076 KB Output is correct
7 Correct 4 ms 5020 KB Output is correct
8 Correct 4 ms 5076 KB Output is correct
9 Correct 4 ms 5076 KB Output is correct
10 Correct 5 ms 5100 KB Output is correct
11 Correct 184 ms 12440 KB Output is correct
12 Correct 216 ms 14760 KB Output is correct
13 Correct 152 ms 15112 KB Output is correct
14 Correct 176 ms 14880 KB Output is correct
15 Correct 173 ms 14700 KB Output is correct
16 Correct 126 ms 14740 KB Output is correct
17 Correct 183 ms 14912 KB Output is correct
18 Correct 193 ms 22480 KB Output is correct
19 Correct 205 ms 14844 KB Output is correct
20 Correct 222 ms 14876 KB Output is correct