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답안 #623158

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
623158 2022-08-05T09:19:19 Z radal Mergers (JOI19_mergers) C++17
0 / 100
 73 ms 39452 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{
                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;
    t[0] += t[1];
    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];
    t[1] = 0;
    if (t[0] == t[2]){
        odd[v] = 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
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 23764 KB Output is correct
2 Correct 13 ms 23764 KB Output is correct
3 Correct 13 ms 23804 KB Output is correct
4 Correct 14 ms 23852 KB Output is correct
5 Correct 13 ms 23796 KB Output is correct
6 Correct 13 ms 23764 KB Output is correct
7 Correct 13 ms 23760 KB Output is correct
8 Correct 12 ms 23764 KB Output is correct
9 Correct 13 ms 23764 KB Output is correct
10 Correct 16 ms 23796 KB Output is correct
11 Correct 13 ms 23864 KB Output is correct
12 Incorrect 14 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 13 ms 23764 KB Output is correct
2 Correct 13 ms 23764 KB Output is correct
3 Correct 13 ms 23804 KB Output is correct
4 Correct 14 ms 23852 KB Output is correct
5 Correct 13 ms 23796 KB Output is correct
6 Correct 13 ms 23764 KB Output is correct
7 Correct 13 ms 23760 KB Output is correct
8 Correct 12 ms 23764 KB Output is correct
9 Correct 13 ms 23764 KB Output is correct
10 Correct 16 ms 23796 KB Output is correct
11 Correct 13 ms 23864 KB Output is correct
12 Incorrect 14 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 13 ms 23764 KB Output is correct
2 Correct 13 ms 23764 KB Output is correct
3 Correct 13 ms 23804 KB Output is correct
4 Correct 14 ms 23852 KB Output is correct
5 Correct 13 ms 23796 KB Output is correct
6 Correct 13 ms 23764 KB Output is correct
7 Correct 13 ms 23760 KB Output is correct
8 Correct 12 ms 23764 KB Output is correct
9 Correct 13 ms 23764 KB Output is correct
10 Correct 16 ms 23796 KB Output is correct
11 Correct 13 ms 23864 KB Output is correct
12 Incorrect 14 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 73 ms 37328 KB Output is correct
2 Correct 68 ms 39452 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 13 ms 23764 KB Output is correct
2 Correct 13 ms 23764 KB Output is correct
3 Correct 13 ms 23804 KB Output is correct
4 Correct 14 ms 23852 KB Output is correct
5 Correct 13 ms 23796 KB Output is correct
6 Correct 13 ms 23764 KB Output is correct
7 Correct 13 ms 23760 KB Output is correct
8 Correct 12 ms 23764 KB Output is correct
9 Correct 13 ms 23764 KB Output is correct
10 Correct 16 ms 23796 KB Output is correct
11 Correct 13 ms 23864 KB Output is correct
12 Incorrect 14 ms 23764 KB Output isn't correct
13 Halted 0 ms 0 KB -