oj.uz

Submission #366499

# Submission time Handle Problem Language Result Execution time Memory
366499 2021-02-14T09:29:09 Z silverfish Janjetina (COCI21_janjetina) C++14
110 / 110
 1025 ms 156100 KB 
#include <bits/stdc++.h>
using namespace std;

/*<DEBUG>*/
#define tem template <typename 
#define can_shift(_X_, ...) enable_if_t<sizeof test<_X_>(0) __VA_ARGS__ 8, debug&> operator<<(T i)
#define _op debug& operator<<
tem C > auto test(C *x) -> decltype(cerr << *x, 0LL);
tem C > char test(...);
tem C > struct itr{C begin, end; };
tem C > itr<C> get_range(C b, C e) { return itr<C>{b, e}; }
struct debug{
#ifdef _LOCAL
	~debug(){ cerr << endl; }
	tem T > can_shift(T, ==){ cerr << boolalpha << i; return *this; }
	tem T> can_shift(T, !=){ return *this << get_range(begin(i), end(i)); }
	tem T, typename U > _op (pair<T, U> i){ 
		return *this << "< " << i.first << " , " << i.second << " >"; }
	tem T> _op (itr<T> i){
		*this <<  "{ ";
		for(auto it = i.begin; it != i.end; it++){
			*this << " , " + (it==i.begin?2:0) << *it;
		}
		return *this << " }";
	}
#else
tem T> _op (const T&) { return *this; }
#endif 
};

string _ARR_(int* arr, int sz){
	string ret = "{ " + to_string(arr[0]); 
	for(int i = 1; i < sz; i++) ret += " , " +  to_string(arr[i]);
	ret += " }"; return ret;
}

#define exp(...) " [ " << #__VA_ARGS__ << " : " << (__VA_ARGS__) << " ]"
/*</DEBUG>*/

typedef long long ll;
typedef unsigned long long ull;
typedef unsigned int uint;
typedef pair<int, int> pii;
//mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

#define pb push_back
#define FAST ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define TC int __TC__; cin >> __TC__; while(__TC__--)
#define ar array

const int INF = 1e9 + 7, N = 1e5;
/*
 *
 * This solution could be better (maybe not faster, but consume less memory) by using only one fenwick tree
 *
 * Im not gonna implement that tho, my solution passes so its ok
 *
 */

int n, k, blocked[N], sz[N], d[N];
ll ans = 0;
vector<ar<int,2>> adj[N];
vector<ar<int,3>> ord[N];
int id=0, par[N], iter = 0, upper;
unordered_map<int, int> mx, fen[2*N];

void add(int i, int j){
	for(; i <= upper+1; i += i&-i){
		++fen[j][i];
	}
}

int get(int i, int j){
	int ret = 0;
	for(; i > 0; i -= i&-i){
		ret += fen[j][i];
	}
	return ret;
}
		
void dfs(int u, int p, int W){
	d[u] = d[p] + 1;
	upper = max(upper, d[u]);
	mx[u] = max(W, mx[p]);

	ord[iter].pb({mx[u], d[u], id});

	if(mx[u] - d[u] >= k) ++ans;

	for(auto [v ,w] : adj[u]){
		if(!blocked[v] && v != p){
			dfs(v, u, w);
		}
	}

}

void solve_root(int u){
	int all = id++;

	d[u] = 0;
	mx[u] = 0;
	upper = 0;
	for(auto [v, W] : adj[u]){
		if(blocked[v]) continue;
		dfs(v, u, W);
		id++;
	}

	sort(ord[iter].begin(), ord[iter].end());

	for(auto [w, l, id] : ord[iter]){
		if(w - l - k > 0){
			ans += get(min(w-l-k, upper+1), all) - get(min(w-l-k, upper+1), id);
		}
		add(l, all);
		add(l, id);
	}
	iter++;
	return;
}

void getsz(int u, int p){
	sz[u] = 1;
	par[u] = p;
	for(auto [v, w] : adj[u]){
		if(v != p && !blocked[v]){
			getsz(v, u);
			sz[u] += sz[v];
		}
	}
}

void decomp(int root){
	getsz(root, root);	
	if(sz[root] == 1) return;
	ar<int,2> centroid = {INF, -1};

	queue<int> q;
	q.push(root);

	while(q.size()){
		int u = q.front();
		q.pop();

		ar<int,2> mx_subtree = {sz[root] - sz[u], u};

		for(auto [v, w] : adj[u]){
			if(v != par[u] && !blocked[v]){
				q.push(v);
				mx_subtree = max(mx_subtree, {sz[v], u});
			}
		}
		centroid = min(centroid, mx_subtree);	
	}



	solve_root(centroid[1]);
//	debug() << exp(centroid[1]);

	blocked[centroid[1]] = 1;	

	for(auto [v, w] : adj[centroid[1]]){
		if(!blocked[v]) decomp(v);
	}

	return;
}

int main(void)
{
	FAST;
	cin >> n >> k;
	for(int i = 1; i < n; ++i){
		int u, v, w; cin >> u >> v >> w;
		--u; --v;
		adj[u].pb({v,w});
		adj[v].pb({u,w});
	}

	decomp(0);

	cout << ans*2 << '\n';

	return 0;
}

Compilation message

Main.cpp: In function 'void dfs(int, int, int)':
Main.cpp:90:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   90 |  for(auto [v ,w] : adj[u]){
      |           ^
Main.cpp: In function 'void solve_root(int)':
Main.cpp:104:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  104 |  for(auto [v, W] : adj[u]){
      |           ^
Main.cpp:112:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  112 |  for(auto [w, l, id] : ord[iter]){
      |           ^
Main.cpp: In function 'void getsz(int, int)':
Main.cpp:126:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  126 |  for(auto [v, w] : adj[u]){
      |           ^
Main.cpp: In function 'void decomp(int)':
Main.cpp:148:12: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  148 |   for(auto [v, w] : adj[u]){
      |            ^
Main.cpp:164:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  164 |  for(auto [v, w] : adj[centroid[1]]){
      |           ^

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 15980 KB Output is correct
2 Correct 12 ms 15980 KB Output is correct
3 Correct 12 ms 16108 KB Output is correct
4 Correct 17 ms 16876 KB Output is correct
5 Correct 16 ms 16876 KB Output is correct
6 Correct 17 ms 16876 KB Output is correct
7 Correct 16 ms 16876 KB Output is correct
8 Correct 18 ms 16876 KB Output is correct
9 Correct 15 ms 16236 KB Output is correct
10 Correct 13 ms 16236 KB Output is correct
11 Correct 13 ms 16236 KB Output is correct
12 Correct 14 ms 16364 KB Output is correct
13 Correct 15 ms 16364 KB Output is correct
14 Correct 15 ms 16364 KB Output is correct
15 Correct 14 ms 16364 KB Output is correct
16 Correct 14 ms 16364 KB Output is correct
17 Correct 14 ms 16364 KB Output is correct
18 Correct 14 ms 16364 KB Output is correct
19 Correct 14 ms 16364 KB Output is correct
20 Correct 14 ms 16364 KB Output is correct
21 Correct 14 ms 16364 KB Output is correct
22 Correct 14 ms 16364 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 15980 KB Output is correct
2 Correct 12 ms 15980 KB Output is correct
3 Correct 12 ms 16108 KB Output is correct
4 Correct 16 ms 16876 KB Output is correct
5 Correct 74 ms 27244 KB Output is correct
6 Correct 487 ms 82224 KB Output is correct
7 Correct 850 ms 153284 KB Output is correct
8 Correct 1025 ms 155972 KB Output is correct
9 Correct 852 ms 153268 KB Output is correct
10 Correct 1010 ms 155844 KB Output is correct
11 Correct 845 ms 153156 KB Output is correct
12 Correct 1012 ms 156100 KB Output is correct
13 Correct 846 ms 153284 KB Output is correct
14 Correct 1000 ms 155972 KB Output is correct
15 Correct 1006 ms 155700 KB Output is correct
16 Correct 973 ms 155940 KB Output is correct
17 Correct 982 ms 155924 KB Output is correct
18 Correct 970 ms 154824 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 15980 KB Output is correct
2 Correct 12 ms 15980 KB Output is correct
3 Correct 12 ms 16108 KB Output is correct
4 Correct 17 ms 16876 KB Output is correct
5 Correct 16 ms 16876 KB Output is correct
6 Correct 17 ms 16876 KB Output is correct
7 Correct 16 ms 16876 KB Output is correct
8 Correct 18 ms 16876 KB Output is correct
9 Correct 15 ms 16236 KB Output is correct
10 Correct 13 ms 16236 KB Output is correct
11 Correct 13 ms 16236 KB Output is correct
12 Correct 14 ms 16364 KB Output is correct
13 Correct 15 ms 16364 KB Output is correct
14 Correct 15 ms 16364 KB Output is correct
15 Correct 14 ms 16364 KB Output is correct
16 Correct 14 ms 16364 KB Output is correct
17 Correct 14 ms 16364 KB Output is correct
18 Correct 14 ms 16364 KB Output is correct
19 Correct 14 ms 16364 KB Output is correct
20 Correct 14 ms 16364 KB Output is correct
21 Correct 14 ms 16364 KB Output is correct
22 Correct 14 ms 16364 KB Output is correct
23 Correct 12 ms 15980 KB Output is correct
24 Correct 12 ms 15980 KB Output is correct
25 Correct 12 ms 16108 KB Output is correct
26 Correct 16 ms 16876 KB Output is correct
27 Correct 74 ms 27244 KB Output is correct
28 Correct 487 ms 82224 KB Output is correct
29 Correct 850 ms 153284 KB Output is correct
30 Correct 1025 ms 155972 KB Output is correct
31 Correct 852 ms 153268 KB Output is correct
32 Correct 1010 ms 155844 KB Output is correct
33 Correct 845 ms 153156 KB Output is correct
34 Correct 1012 ms 156100 KB Output is correct
35 Correct 846 ms 153284 KB Output is correct
36 Correct 1000 ms 155972 KB Output is correct
37 Correct 1006 ms 155700 KB Output is correct
38 Correct 973 ms 155940 KB Output is correct
39 Correct 982 ms 155924 KB Output is correct
40 Correct 970 ms 154824 KB Output is correct
41 Correct 12 ms 15980 KB Output is correct
42 Correct 849 ms 153284 KB Output is correct
43 Correct 1014 ms 155924 KB Output is correct
44 Correct 846 ms 153156 KB Output is correct
45 Correct 1010 ms 155972 KB Output is correct
46 Correct 849 ms 153284 KB Output is correct
47 Correct 1025 ms 156100 KB Output is correct
48 Correct 851 ms 153284 KB Output is correct
49 Correct 1014 ms 155972 KB Output is correct
50 Correct 1010 ms 155460 KB Output is correct
51 Correct 996 ms 155844 KB Output is correct
52 Correct 285 ms 41924 KB Output is correct
53 Correct 303 ms 42308 KB Output is correct
54 Correct 277 ms 42160 KB Output is correct
55 Correct 295 ms 42308 KB Output is correct
56 Correct 303 ms 42540 KB Output is correct
57 Correct 624 ms 59676 KB Output is correct
58 Correct 639 ms 61380 KB Output is correct
59 Correct 681 ms 62020 KB Output is correct
60 Correct 670 ms 61768 KB Output is correct
61 Correct 730 ms 61888 KB Output is correct
62 Correct 519 ms 56516 KB Output is correct
63 Correct 594 ms 59144 KB Output is correct
64 Correct 597 ms 59204 KB Output is correct
65 Correct 28 ms 18028 KB Output is correct
66 Correct 12 ms 15980 KB Output is correct