Submission #875849

#	Time	Username	Problem	Language	Result	Execution time	Memory
875849		hqminhuwu	Race (IOI11_race)	C++14	0 / 100	16 ms	54364 KiB

race

#include <bits/stdc++.h>
#define forr(_a,_b,_c) for(_a = (_b); _a <= (_c); ++_a)
#define ford(_a,_b,_c) for(_a = (_b) + 1; _a --> (_c);)
#define forf(_a,_b,_c) for(_a = (_b); _a < (_c); ++_a)
#define st first
#define nd second
#define ll long long
#define ull unsigned long long
#define pii pair <int,int>
#define pll pair <ll,ll>
#define piii pair <int,pii>
#define vi vector <int>
#define pb push_back
#define mp make_pair
#define all(x) begin(x),end(x)
#define file "test"
 
 
using namespace std;
const int N = 1e6 + 5;
const ll oo = 1e9;
const ll mod = 1e9 + 7;
 
vector <ll> s[N];
vector <pll> a[N];
ll ans, h[N], f[N];
ll k;
void dfs (int u, int p){
	f[u] = 0;
    for (pii e : a[u]){
		int v = e.st;
		if (v != p){
			h[v] = e.nd;
			dfs(v,u);
			if (s[v].size() > s[u].size())
				swap(s[v],s[u]), swap (f[u], f[v]);
			for (int j = 0; j < s[v].size(); j++){
				int d = s[v].size() - j - 1;
				if (k - d >= 0 && k - d < s[u].size())
					ans = min (ans, s[v][j] + s[u][s[u].size() - (k - d) - 1] + f[u] + f[v]);
			}
			for (int j = 0; j < s[v].size(); j++)
				s[u][s[u].size() - (s[v].size() - j)]  = min (s[u][s[u].size() - (s[v].size() - j)], s[v][j] - f[u] + f[v]); 
		}
	}
    s[u].pb(-f[u]);
	for (int i = 1; i < h[u]; i++)
		s[u].pb(oo);
	f[u]++;
    if (k < s[u].size())
        ans = min (ans, s[u][s[u].size() - k - 1] + f[u]);
	// if (u == 2)
	// for (int w : s[u])
	// 	cout << w << " ";
	// cout << "\n";
}
int n,i,u,v,w;
int best_path (int nn, int kk, int edge[][2], int ww[]){
	ans = oo;
    n = nn;
	k = kk;
    if (k == 1)
        return 0;
    forf (i,0,n - 1){
        u = edge[i][0];
		v = edge[i][v];
		w = ww[i];
        a[u].pb({v,w});
        a[v].pb({u,w});
    }
    dfs(0,0);
  ans--;
    return ((ans <= (n - 1)) ? ans : -1);
}

Compilation message (stderr)

race.cpp: In function 'void dfs(int, int)':
race.cpp:37:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |    for (int j = 0; j < s[v].size(); j++){
      |                    ~~^~~~~~~~~~~~~
race.cpp:39:29: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     if (k - d >= 0 && k - d < s[u].size())
      |                       ~~~~~~^~~~~~~~~~~~~
race.cpp:42:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |    for (int j = 0; j < s[v].size(); j++)
      |                    ~~^~~~~~~~~~~~~
race.cpp:50:11: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |     if (k < s[u].size())
      |         ~~^~~~~~~~~~~~~

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