oj.uz

Submission #614054

# Submission time Handle Problem Language Result Execution time Memory
614054 2022-07-30T17:27:00 Z IWTIM Logičari (COCI21_logicari) C++14
110 / 110
 250 ms 41412 KB 
# include <bits/stdc++.h>
using namespace std;
using ll = long long;
using db = long double; // or double, if TL is tight
using str = string; // yay python! 
 
// pairs
using pii = pair<int,int>;
using pl = pair<ll,ll>;
using pd = pair<db,db>;
#define mp make_pair
#define f first
#define s second
 
#define tcT template<class T
#define tcTU tcT, class U
// ^ lol this makes everything look weird but I'll try it
tcT> using V = vector<T>; 
tcT, size_t SZ> using AR = array<T,SZ>; 
using vi = V<int>;
using vb = V<bool>;
using vl = V<ll>;
using vd = V<db>;
using vs = V<str>;
using vpi = V<pii>;
using vpl = V<pl>;
using vpd = V<pd>;
 
// vectors
// oops size(x), rbegin(x), rend(x) need C++17
#define sz(x) int((x).size())
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define rall(x) x.rbegin(), x.rend() 
#define sor(x) sort(all(x)) 
#define rsz resize
#define ins insert 
#define pb push_back
#define eb emplace_back
#define ft front()
#define bk back()
 
#define lb lower_bound
#define ub upper_bound
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define rep(a) F0R(_,a)
#define each(a,x) for (auto& a: x)
const int MOD = 998244353;
const int MX = 2e5+5;
const ll BIG = 1e18; // not too close to LLONG_MAX
const db PI = acos((db)-1);
const int dx[4]{1,0,-1,0}, dy[4]{0,1,0,-1}; // for every grid problem!!
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count()); 
template<class T> using pqg = priority_queue<T,vector<T>,greater<T>>;
struct DSU {
	vi e; void init(int N) { e = vi(N,-1); }
	int get(int x) { return e[x] < 0 ? x : e[x] = get(e[x]); } 
	bool sameSet(int a, int b) { return get(a) == get(b); }
	int size(int x) { return -e[get(x)]; }
	bool unite(int x, int y) { // union by size
		x = get(x), y = get(y); if (x == y) return 0;
		if (e[x] > e[y]) swap(x,y);
		e[x] += e[y]; e[y] = x; return 1;
	}
};
/*
inline namespace Helpers {
	//////////// is_iterable
	// https://stackoverflow.com/questions/13830158/check-if-a-variable-type-is-iterable
	// this gets used only when we can call begin() and end() on that type
	tcT, class = void> struct is_iterable : false_type {};
	tcT> struct is_iterable<T, void_t<decltype(begin(declval<T>())),
	                                  decltype(end(declval<T>()))
	                                 >
	                       > : true_type {};
	tcT> constexpr bool is_iterable_v = is_iterable<T>::value;
 
	//////////// is_readable
	tcT, class = void> struct is_readable : false_type {};
	tcT> struct is_readable<T,
	        typename std::enable_if_t<
	            is_same_v<decltype(cin >> declval<T&>()), istream&>
	        >
	    > : true_type {};
	tcT> constexpr bool is_readable_v = is_readable<T>::value;
 
	//////////// is_printable
	// // https://nafe.es/posts/2020-02-29-is-printable/
	tcT, class = void> struct is_printable : false_type {};
	tcT> struct is_printable<T,
	        typename std::enable_if_t<
	            is_same_v<decltype(cout << declval<T>()), ostream&>
	        >
	    > : true_type {};
	tcT> constexpr bool is_printable_v = is_printable<T>::value;
}*/
#define f first
#define s second
#define pb push_back
#define int long long
const int N = 3e5 + 5, inf = 1e9;
int t,n,a[N],fix[N],par[N],root,special,b[N];
vector <int> v[N];
int dp[N][2][2][2][2];
void dfs(int a, int p) {
	fix[a] = 1;
	for (int i = 0; i < (int)v[a].size(); i++){
		int to = v[a][i];
		if (to == p) continue;
		if (fix[to]) {
			root = a;
			special = to;
		}
		else
		dfs(to,a);
	}
}
void dfs1(int a, int p) {
	par[a] = p;
	for (int i = 0; i < (int)v[a].size(); i++) {
		int to = v[a][i];
		if (to == p) continue;
		dfs1(to,a);
	}
}
void dfs2(int a, int p, int me, int up, int rt, int sp) {
	if (dp[a][me][up][rt][sp] != -1) return ;
	if ((a == special && me != sp) ||  (a == root && me != rt) || (p == root && up != rt) || (p == special && up != sp) || (a == special && up && rt)) {
		dp[a][me][up][rt][sp] = inf;
		return ;
	}
	int ff = 0;
	if (a != root) {
		if(up == 1) ff = 1;
		if (a == special && rt) ff = 1;
	}
	else if (sp) ff = 1;
	int dif = 1e9, sum = 0;
	for (int i = 0; i < (int)v[a].size(); i++) {
		int to = v[a][i];
		if (to == p) continue;
	 	dfs2(to,a,0,me,rt,sp);
		dfs2(to,a,1,me,rt,sp);
		sum += dp[to][0][me][rt][sp];
		dif = min(dif, dp[to][1][me][rt][sp] - dp[to][0][me][rt][sp]);
	}
	dp[a][me][up][rt][sp] = (ff == 1 ? sum + me : sum + dif + me);
}
main() {
    std::ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    cin>>n;
    for (int i = 1; i <= n; i++) {
    	cin>>a[i]>>b[i];
    	v[a[i]].pb(b[i]);
    	v[b[i]].pb(a[i]);
	}
	dfs(1,0);
	for (int i = 1; i <= n; i++) v[i].clear();
	for (int i = 1; i <= n; i++) {
		if (min(a[i],b[i]) == min(root,special) && max(a[i],b[i]) == max(root,special)) {}
		else v[a[i]].pb(b[i]), v[b[i]].pb(a[i]);
	}
	for (int i = 1; i <= n; i++) {
		for (int j = 0; j <= 1; j++) {
			for (int jj = 0; jj <= 1; jj++) {
				for (int ii = 0; ii <= 1; ii++) {
					dp[i][j][jj][ii][0] = dp[i][j][jj][ii][1] = -1;
				}
			}
		}
	}
	int ans = inf;
	dfs1(root,0);
	for (int rt = 0; rt <= 1; rt++) {
		for (int sp = 0; sp <= 1; sp++) {
			dfs2(root,0,rt,0,rt,sp);
			ans = min(ans,dp[root][rt][0][rt][sp]);
		}
	}
	cout<<(ans > n ? -1 : ans)<<endl;
}

Compilation message

Main.cpp:152:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  152 | main() {
      | ^~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 4 ms 7380 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 247 ms 40168 KB Output is correct
6 Correct 218 ms 40228 KB Output is correct
7 Correct 250 ms 40252 KB Output is correct
8 Correct 218 ms 40248 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 5 ms 7380 KB Output is correct
3 Correct 5 ms 7320 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 5 ms 7380 KB Output is correct
8 Correct 4 ms 7380 KB Output is correct
9 Correct 5 ms 7380 KB Output is correct
10 Correct 5 ms 7292 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 4 ms 7380 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 5 ms 7380 KB Output is correct
3 Correct 5 ms 7320 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 5 ms 7380 KB Output is correct
8 Correct 4 ms 7380 KB Output is correct
9 Correct 5 ms 7380 KB Output is correct
10 Correct 5 ms 7292 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 4 ms 7380 KB Output is correct
13 Correct 5 ms 7508 KB Output is correct
14 Correct 5 ms 7508 KB Output is correct
15 Correct 5 ms 7508 KB Output is correct
16 Correct 6 ms 7516 KB Output is correct
17 Correct 5 ms 7380 KB Output is correct
18 Correct 5 ms 7508 KB Output is correct
19 Correct 6 ms 7384 KB Output is correct
20 Correct 5 ms 7508 KB Output is correct
21 Correct 5 ms 7508 KB Output is correct
22 Correct 5 ms 7516 KB Output is correct
23 Correct 6 ms 7636 KB Output is correct
24 Correct 5 ms 7636 KB Output is correct

Subtask #4
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 4 ms 7380 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 247 ms 40168 KB Output is correct
6 Correct 218 ms 40228 KB Output is correct
7 Correct 250 ms 40252 KB Output is correct
8 Correct 218 ms 40248 KB Output is correct
9 Correct 4 ms 7380 KB Output is correct
10 Correct 5 ms 7380 KB Output is correct
11 Correct 5 ms 7320 KB Output is correct
12 Correct 4 ms 7380 KB Output is correct
13 Correct 4 ms 7380 KB Output is correct
14 Correct 4 ms 7380 KB Output is correct
15 Correct 5 ms 7380 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 5 ms 7380 KB Output is correct
18 Correct 5 ms 7292 KB Output is correct
19 Correct 4 ms 7380 KB Output is correct
20 Correct 4 ms 7380 KB Output is correct
21 Correct 5 ms 7508 KB Output is correct
22 Correct 5 ms 7508 KB Output is correct
23 Correct 5 ms 7508 KB Output is correct
24 Correct 6 ms 7516 KB Output is correct
25 Correct 5 ms 7380 KB Output is correct
26 Correct 5 ms 7508 KB Output is correct
27 Correct 6 ms 7384 KB Output is correct
28 Correct 5 ms 7508 KB Output is correct
29 Correct 5 ms 7508 KB Output is correct
30 Correct 5 ms 7516 KB Output is correct
31 Correct 6 ms 7636 KB Output is correct
32 Correct 5 ms 7636 KB Output is correct
33 Correct 155 ms 25728 KB Output is correct
34 Correct 154 ms 25756 KB Output is correct
35 Correct 133 ms 25752 KB Output is correct
36 Correct 168 ms 25744 KB Output is correct
37 Correct 27 ms 11908 KB Output is correct
38 Correct 148 ms 25728 KB Output is correct
39 Correct 14 ms 8916 KB Output is correct
40 Correct 135 ms 25328 KB Output is correct
41 Correct 90 ms 28036 KB Output is correct
42 Correct 123 ms 28096 KB Output is correct
43 Correct 220 ms 41412 KB Output is correct
44 Correct 180 ms 34756 KB Output is correct