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답안 #623134

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
623134 2022-08-05T08:48:21 Z radal Mergers (JOI19_mergers) C++17
0 / 100
 136 ms 39488 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[1]++;
                else t[3]++;
            }
            else{
                if (odd[u]) t[0]++;
                else t[2]++;
            }
            dp[v] += dp[u];
        }
    }
    t[0] += t[1];
    t[1] = 0;
    if (t[0] == t[2]){
        odd[v] = 0;
        return;
    }
    if (t[0] < t[2]){
        t[2] -= t[0];
        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
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23768 KB Output is correct
2 Correct 13 ms 23868 KB Output is correct
3 Correct 13 ms 23868 KB Output is correct
4 Correct 11 ms 23852 KB Output is correct
5 Correct 11 ms 23724 KB Output is correct
6 Correct 11 ms 23764 KB Output is correct
7 Correct 13 ms 23784 KB Output is correct
8 Correct 15 ms 23824 KB Output is correct
9 Correct 12 ms 23764 KB Output is correct
10 Correct 14 ms 23764 KB Output is correct
11 Correct 14 ms 23832 KB Output is correct
12 Incorrect 12 ms 23764 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #2
0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23768 KB Output is correct
2 Correct 13 ms 23868 KB Output is correct
3 Correct 13 ms 23868 KB Output is correct
4 Correct 11 ms 23852 KB Output is correct
5 Correct 11 ms 23724 KB Output is correct
6 Correct 11 ms 23764 KB Output is correct
7 Correct 13 ms 23784 KB Output is correct
8 Correct 15 ms 23824 KB Output is correct
9 Correct 12 ms 23764 KB Output is correct
10 Correct 14 ms 23764 KB Output is correct
11 Correct 14 ms 23832 KB Output is correct
12 Incorrect 12 ms 23764 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #3
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23768 KB Output is correct
2 Correct 13 ms 23868 KB Output is correct
3 Correct 13 ms 23868 KB Output is correct
4 Correct 11 ms 23852 KB Output is correct
5 Correct 11 ms 23724 KB Output is correct
6 Correct 11 ms 23764 KB Output is correct
7 Correct 13 ms 23784 KB Output is correct
8 Correct 15 ms 23824 KB Output is correct
9 Correct 12 ms 23764 KB Output is correct
10 Correct 14 ms 23764 KB Output is correct
11 Correct 14 ms 23832 KB Output is correct
12 Incorrect 12 ms 23764 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #4
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 82 ms 37428 KB Output is correct
2 Correct 136 ms 39488 KB Output is correct
3 Incorrect 14 ms 24276 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23768 KB Output is correct
2 Correct 13 ms 23868 KB Output is correct
3 Correct 13 ms 23868 KB Output is correct
4 Correct 11 ms 23852 KB Output is correct
5 Correct 11 ms 23724 KB Output is correct
6 Correct 11 ms 23764 KB Output is correct
7 Correct 13 ms 23784 KB Output is correct
8 Correct 15 ms 23824 KB Output is correct
9 Correct 12 ms 23764 KB Output is correct
10 Correct 14 ms 23764 KB Output is correct
11 Correct 14 ms 23832 KB Output is correct
12 Incorrect 12 ms 23764 KB Output isn't correct
13 Halted 0 ms 0 KB -