Submission #600985

#	Time	Username	Problem	Language	Result	Execution time	Memory
600985		Meloric	Race (IOI11_race)	C++14	0 / 100	1 ms	340 KiB

race

#pragma GCC optimize("O3")
#include "race.h"
#include <bits/stdc++.h>
 
#define pb push_back
#define int int64_t
#define pii pair<int, int>
#define X first
#define Y second
#define all(x) (x).begin(),(x).end()
#define lb lower_bound
#define ub upper_bound
#define speSet pair<pii, set<pii>>


using namespace std;
 
const int inf = 1e8;
 
void p(auto A){
	for(auto e : A)cout << e << ' ';
	cout << '\n';
}
 
struct special_set{
	/*set<pii> S;
	pii delta = {0, 0};
	
	void insert(pii e){
		S.insert({e.X-delta.X, e.Y-delta.Y});
	}
	void update(pii dx){
		delta.X+=dx.X;
		delta.Y+=dx.Y;
	}
	int find(int x){
		x-=delta.X;
		if(S.lb({x, -inf}) == S.end())return inf;
		if(S.lb({x, -inf})->X != x)return inf;
		return S.lb({x, -inf})->Y+delta.Y;
	}
	pii pop(){
		pii ret = *S.begin();
		S.erase(S.begin());
		ret.X+=delta.X;
		ret.Y+=delta.Y;
		return ret;
	}
	int size(){
		return S.size();
	}
	void p(){
		//for(auto [e, f] : S)cout << e+delta.X << ' '<< f+delta.Y << endl;
	}
	*/
};
 
signed best_path(signed N, signed K, signed H[][2], signed L[])
{
  int n = N;
  int k = K; 
  vector<vector<pii>> g(n, vector<pii>());
  for(int i = 0; i< n-1; i++){
	  int c = H[i][0];
	  int d = H[i][1];
	  int w = L[i];
	  g[c].pb({d, w});
	  g[d].pb({c, w});
  }
  int ret = inf;
  vector<speSet>A(n);
  auto dfs = [&](auto&&self, int u, int p)->void{
	  A[u].Y.insert({0, 0});
	  for(auto [v, w] : g[u])if(v!=p){
		  self(self, v, u);
		  A[v].X.X+=w;
		  A[v].X.Y+=1;
		  if(A[u].Y.size() < A[v].Y.size())swap(A[u], A[v]);
		  auto [vx, vy] = A[v].X;
		  auto [ux, uy] = A[u].X;
		  for(auto [ex, ey] : A[v].Y){
			  ex+=vx; ey+=vy;
			  auto it = A[u].Y.lb({k-ex-ux, -1});
			  if(it != A[u].Y.end() && it->X+ux == k-ex)ret=min(ret, ey+it->Y+uy);
		  }
		  for(auto [ex, ey] : A[v].Y){
			  ex = ex+vx-ux;
			  ey = ey+vy-uy;
			  A[u].Y.insert({ex, ey});
		  }
	  }
  };  
  /*
  auto dfs = [&](auto&& self, int u, int p)->special_set*{
	  //cout << u << endl;
	  special_set* S = new special_set();
	  S->insert({0, 0});
	  vector<pii> V;
	  for(auto [v, w] : g[u])if(v!=p){
		  special_set* O = self(self, v, u);
		  O->update(make_pair(w, 1ll));
		  
		  if(S->size() < O->size())swap(S, O);
		  while(O->size()){
			  pii e = O->pop();
			  //cout << u << ' '<< e.X << ' '<< e.Y << ' ' << endl;
			  ret = min(ret, e.Y+S->find(k-e.X));
			  if(e.X > k)continue;
			  V.pb(e);
			  //S.insert(e);
		  }
		  for(auto e : V)S->insert(e);
	  }
	  return S;
  };
  */
  dfs(dfs, 0, 0);
  if(ret == inf)return -1;
  return ret;
}
/*
void solve(){
	signed N, K, H[100][2], L[100];
	cin >> N >> K;
	for(int i = 0; i< N-1; i++){
		cin >> H[i][0] >> H[i][1] >> L[i];
	}
	cout << best_path(N, K, H, L);
}
signed main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	
	int t = 1;
	//cin >> t;
	while(t--)solve();
}*/

Compilation message (stderr)

race.cpp:20:8: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   20 | void p(auto A){
      |        ^~~~
race.cpp: In lambda function:
race.cpp:74:13: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   74 |    for(auto [v, w] : g[u])if(v!=p){
      |             ^
race.cpp:79:10: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   79 |     auto [vx, vy] = A[v].X;
      |          ^
race.cpp:80:10: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   80 |     auto [ux, uy] = A[u].X;
      |          ^
race.cpp:81:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   81 |     for(auto [ex, ey] : A[v].Y){
      |              ^
race.cpp:86:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   86 |     for(auto [ex, ey] : A[v].Y){
      |              ^

• Subtask 1: 0 / 9
• Subtask 2: 0 / 12
• Subtask 3: 0 / 22
• Subtask 4: 0 / 57