Submission #703326

#	Time	Username	Problem	Language	Result	Execution time	Memory
703326		Chal1shkan	Race (IOI11_race)	C++14	Compilation error	0 ms	0 KiB

race

# include <bits/stdc++.h>
# include "race.h"

# define pb push_back
# define ff first
# define ss second
# define nl "\n"
# define sz(x) ((int)(x).size())
# define deb(x) cerr << #x  << " = " << x << endl; 
# define pll pair <ll, ll>
# define pii pair <int, int> 
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
 
const ll maxn = 2e5 + 25;
const ll inf = 2e9 + 0;
const ll mod = 998244353;
const ll dx[] = {-1, 1, 0, 0};
const ll dy[] = {0, 0, -1, 1};
 
using namespace std;

ll n, k, ans;
vector <pii> g[maxn];
ll sz[maxn];
bool used[maxn];
ll mn[maxn];

void dfs_calc (ll v, ll pa)
{
    sz[v] = 1;
    for (pii i : g[v])
    {
        ll to = i.ff, w = i.ss;
        if (to == pa || used[to]) continue;
        dfs_calc(to, v);
        sz[v] += sz[to];
    }
}

ll find_c (ll v, ll pa, ll siz)
{
    for (pii i : g[v])
    {
        ll to = i.ff, w = i.ss;
        if (to == pa || used[to]) continue;
        if (sz[to] + sz[to] > siz)
        {
            return find_c(to, v, siz);
        }
    }
    return v;
}

void dfs_add (ll v, ll pa, ll d1, ll d2)
{
    mn[d1] = min(mn[d1], d2);
    for (pii i : g[v])
    {
        ll to = i.ff, w = i.ss;
        if (to == pa || used[to]) continue;
        dfs_add(to, v, d1 + w, d2 + 1);
    }
}

void dfs_del (ll v, ll pa, ll d1, ll d2)
{
    mn[d1] = inf;
    for (pii i : g[v])
    {
        ll to = i.ff, w = i.ss;
        if (to == pa || used[to]) continue;
        dfs_del(to, v, d1 + w, d2 + 1);
    }
}

void dfs_ans (ll v, ll pa, ll d1, ll d2)
{
    if (d1 > k) return;
    ans = min(ans, d2 + mn[k - d1]);
    for (pii i : g[v])
    {
        ll to = i.ff, w = i.ss;
        if (to == pa || used[to]) continue;
        dfs_ans(to, v, d1 + w, d2 + 1);
    }
}

void centroid (ll v)
{
    dfs_calc(v, v);
    v = find_c(v, v, sz[v]);    
    mn[0] = 0;
    for (pii i : g[v])
    {
        ll to = i.ff, w = i.ss;
        if (used[to]) continue;
        dfs_ans(to, v, w, 1);
        dfs_add(to, v, w, 1);
    }
    mn[0] = inf;
    for (pii i : g[v])
    {
        ll to = i.ff, w = i.ss;
        if (used[to]) continue;
        dfs_del(to, v, w, 1);
    }
    used[v] = 1;
    for (pii i : g[v])
    {
        ll to = i.ff, w = i.ss;
        if (used[to]) continue;
        centroid(to);   
    }
}

ll best_path(ll N, ll K, ll H[][2], ll L[])
{
  n = N, k = K, ans = inf;
  for(ll i = 0; i < n - 1; ++i){
    g[H[i][0] + 1].pb({H[i][1] + 1, L[i]});
    g[H[i][1] + 1].pb({H[i][0] + 1, L[i]});
  }
  for (ll i = 1; i < n; ++i) mn[i] = inf; 
  centroid(1);
  return (ans == inf ? -1 : ans);
}

Compilation message (stderr)

race.cpp: In function 'void dfs_calc(ll, ll)':
race.cpp:36:23: warning: unused variable 'w' [-Wunused-variable]
   36 |         ll to = i.ff, w = i.ss;
      |                       ^
race.cpp: In function 'll find_c(ll, ll, ll)':
race.cpp:47:23: warning: unused variable 'w' [-Wunused-variable]
   47 |         ll to = i.ff, w = i.ss;
      |                       ^
race.cpp: In function 'void centroid(ll)':
race.cpp:113:23: warning: unused variable 'w' [-Wunused-variable]
  113 |         ll to = i.ff, w = i.ss;
      |                       ^
/usr/bin/ld: /tmp/cc50W2YS.o: in function `main':
grader.cpp:(.text.startup+0x28): undefined reference to `best_path(int, int, int (*) [2], int*)'
collect2: error: ld returned 1 exit status