oj.uz

Submission #623170

# Submission time Handle Problem Language Result Execution time Memory
623170 2022-08-05T09:30:37 Z radal Mergers (JOI19_mergers) C++17
10 / 100
 68 ms 39492 KB 
#include <bits/stdc++.h>
#pragma GCC target("sse,sse2,avx2")
#pragma GCC optimize("unroll-loops,O2")
#define rep(i,l,r) for (int i = l; i < r; i++)
#define repr(i,r,l) for (int i = r; i >= l; i--)
#define X first
#define Y second
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define endl '\n'
#define debug(x) cerr << #x << " : " << x << endl;
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pll;
constexpr int N = 5e5+10,mod = 998244353,inf = 1e9+10,sq = 700;
inline int mkay(int a,int b){
    if (a+b >= mod) return a+b-mod;
    if (a+b < 0) return a+b+mod;
    return a+b;
}
 
inline int poww(int a,int k){
    if (k < 0) return 0;
    int z = 1;
    while (k){
        if (k&1) z = 1ll*z*a%mod;
        a = 1ll*a*a%mod;
        k /= 2;
    } 
    return z; 
}
vector<int> adj[N],col[N];
int par[N][20],h[N],T,tin[N],calc[N],dp[N];
int odd[N]; 

void pre(int v,int p){
    par[v][0] = p;
    tin[v] = T++;
    for (int u : adj[v]){
        if (u == p) continue;
        h[u] = h[v]+1;
        pre(u,v);
    }
}
bool cmp(int u,int v){
    return (tin[u] < tin[v]);
}

int lca(int u,int v){
    if (h[u] < h[v]) swap(u,v);
    repr(i,19,0){
        if ((1 << i) <= h[u]-h[v]) u = par[u][i];
    }
    if (u == v) return u;
    repr(i,19,0){
        if (par[u][i] != par[v][i]){
            v = par[v][i];
            u = par[u][i];
        }
    }
    return par[v][0];
}
void dfs(int v,int p){
    int t[4] = {0,0,0,0};
    for (int u : adj[v]){
        if (u != p){
            dfs(u,v);
            calc[v] += calc[u];
       /*     if (v == 1){
                debug(u);
                debug(calc[u]);
                debug(dp[u]);
                debug(odd[u]);
            }*/
            if (calc[u]){
                if (odd[u]) t[0]++;
                if (odd[u] && dp[u]-1) t[1]++;
            }
            else{
                if (odd[u]) t[0]++;
                else if (!dp[u]) t[2]++;
                else t[3]++;
            }
            dp[v] += dp[u];
        }
    }
    /*if (v == 1){
        debug(t[0]);
        debug(t[1]);
        debug(t[2]);
        debug(t[3]);
    }*/
    t[3] %= 2;
    if (t[3]){
        if (!t[2] && !t[0]){
            dp[v]++;
            odd[v] = 1;
            return;
        }
        if (t[2]-2 >= t[0]){
            t[2] -= 2;
            dp[v]++;
        }
        else if (t[0] && t[2]){
            t[2]--;
            t[0]--;
        }
        else if (t[0] == 1){
            odd[v] = 0;
            return;
        }
        else if (t[2] == 1){
            dp[v]++;
            odd[v] = 0;
            return;
        }
        else if (t[0] > 1){
            t[0] -= 2;
            dp[v]--;
        }
        t[3] = 0;
    }
    t[2] += t[3];
    if (t[0] == t[2]){
        odd[v] = (t[1] > 0);
        return;
    }
    if (t[0] < t[2]){
        t[2] -= t[0];
        if (t[2] > 2 && t[3]){
            dp[v]++;
            t[2] -= 3;
        }
        dp[v] += (t[2]+1)/2;
        odd[v] = t[2]%2;
        return;
    }
    t[0] -= t[2];
    odd[v] = t[0]%2;
    dp[v] -= t[0]/2;
}
int main(){
    ios :: sync_with_stdio(0); cin.tie(0);
    int n,k;
    cin >> n >> k;
    rep(i,1,n){
        int u,v;
        cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    rep(i,1,n+1){
        int c;
        cin >> c;
        col[c].pb(i);
    }
    rep(i,1,k+1)  sort(all(col[i]),cmp);
    pre(1,0);
    rep(j,1,20){
        rep(i,2,n+1)
            par[i][j] = par[par[i][j-1]][j-1];
    }
    rep(i,1,k+1){
        int sz = col[i].size();
        if (sz < 2) continue;
        rep(j,1,sz){
            calc[col[i][j]]++;
            calc[col[i][j-1]]++;
            calc[lca(col[i][j],col[i][j-1])] -= 2;
        }
    }
    dfs(1,0);
    cout << dp[1];
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 13 ms 23808 KB Output is correct
3 Correct 14 ms 23752 KB Output is correct
4 Correct 12 ms 23852 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 14 ms 23744 KB Output is correct
7 Correct 12 ms 23764 KB Output is correct
8 Correct 14 ms 23764 KB Output is correct
9 Correct 15 ms 23800 KB Output is correct
10 Correct 16 ms 23848 KB Output is correct
11 Correct 15 ms 23820 KB Output is correct
12 Correct 14 ms 23764 KB Output is correct
13 Correct 14 ms 23740 KB Output is correct
14 Correct 15 ms 23780 KB Output is correct
15 Correct 12 ms 23800 KB Output is correct
16 Correct 12 ms 23732 KB Output is correct
17 Correct 13 ms 23856 KB Output is correct
18 Correct 13 ms 23764 KB Output is correct
19 Correct 15 ms 23824 KB Output is correct
20 Correct 12 ms 23844 KB Output is correct
21 Correct 12 ms 23748 KB Output is correct
22 Correct 13 ms 23824 KB Output is correct
23 Correct 15 ms 23764 KB Output is correct
24 Correct 12 ms 23848 KB Output is correct

Subtask #2
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 13 ms 23808 KB Output is correct
3 Correct 14 ms 23752 KB Output is correct
4 Correct 12 ms 23852 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 14 ms 23744 KB Output is correct
7 Correct 12 ms 23764 KB Output is correct
8 Correct 14 ms 23764 KB Output is correct
9 Correct 15 ms 23800 KB Output is correct
10 Correct 16 ms 23848 KB Output is correct
11 Correct 15 ms 23820 KB Output is correct
12 Correct 14 ms 23764 KB Output is correct
13 Correct 14 ms 23740 KB Output is correct
14 Correct 15 ms 23780 KB Output is correct
15 Correct 12 ms 23800 KB Output is correct
16 Correct 12 ms 23732 KB Output is correct
17 Correct 13 ms 23856 KB Output is correct
18 Correct 13 ms 23764 KB Output is correct
19 Correct 15 ms 23824 KB Output is correct
20 Correct 12 ms 23844 KB Output is correct
21 Correct 12 ms 23748 KB Output is correct
22 Correct 13 ms 23824 KB Output is correct
23 Correct 15 ms 23764 KB Output is correct
24 Correct 12 ms 23848 KB Output is correct
25 Incorrect 12 ms 23764 KB Output isn't correct
26 Halted 0 ms 0 KB -

Subtask #3
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 13 ms 23808 KB Output is correct
3 Correct 14 ms 23752 KB Output is correct
4 Correct 12 ms 23852 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 14 ms 23744 KB Output is correct
7 Correct 12 ms 23764 KB Output is correct
8 Correct 14 ms 23764 KB Output is correct
9 Correct 15 ms 23800 KB Output is correct
10 Correct 16 ms 23848 KB Output is correct
11 Correct 15 ms 23820 KB Output is correct
12 Correct 14 ms 23764 KB Output is correct
13 Correct 14 ms 23740 KB Output is correct
14 Correct 15 ms 23780 KB Output is correct
15 Correct 12 ms 23800 KB Output is correct
16 Correct 12 ms 23732 KB Output is correct
17 Correct 13 ms 23856 KB Output is correct
18 Correct 13 ms 23764 KB Output is correct
19 Correct 15 ms 23824 KB Output is correct
20 Correct 12 ms 23844 KB Output is correct
21 Correct 12 ms 23748 KB Output is correct
22 Correct 13 ms 23824 KB Output is correct
23 Correct 15 ms 23764 KB Output is correct
24 Correct 12 ms 23848 KB Output is correct
25 Incorrect 12 ms 23764 KB Output isn't correct
26 Halted 0 ms 0 KB -

Subtask #4
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 67 ms 37296 KB Output is correct
2 Correct 68 ms 39492 KB Output is correct
3 Incorrect 14 ms 24268 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 13 ms 23808 KB Output is correct
3 Correct 14 ms 23752 KB Output is correct
4 Correct 12 ms 23852 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 14 ms 23744 KB Output is correct
7 Correct 12 ms 23764 KB Output is correct
8 Correct 14 ms 23764 KB Output is correct
9 Correct 15 ms 23800 KB Output is correct
10 Correct 16 ms 23848 KB Output is correct
11 Correct 15 ms 23820 KB Output is correct
12 Correct 14 ms 23764 KB Output is correct
13 Correct 14 ms 23740 KB Output is correct
14 Correct 15 ms 23780 KB Output is correct
15 Correct 12 ms 23800 KB Output is correct
16 Correct 12 ms 23732 KB Output is correct
17 Correct 13 ms 23856 KB Output is correct
18 Correct 13 ms 23764 KB Output is correct
19 Correct 15 ms 23824 KB Output is correct
20 Correct 12 ms 23844 KB Output is correct
21 Correct 12 ms 23748 KB Output is correct
22 Correct 13 ms 23824 KB Output is correct
23 Correct 15 ms 23764 KB Output is correct
24 Correct 12 ms 23848 KB Output is correct
25 Incorrect 12 ms 23764 KB Output isn't correct
26 Halted 0 ms 0 KB -