oj.uz

Submission #623175

# Submission time Handle Problem Language Result Execution time Memory
623175 2022-08-05T09:33:43 Z radal Mergers (JOI19_mergers) C++17
10 / 100
 71 ms 39420 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] = (t[1] > 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 13 ms 23764 KB Output is correct
2 Correct 13 ms 23812 KB Output is correct
3 Correct 12 ms 23824 KB Output is correct
4 Correct 12 ms 23856 KB Output is correct
5 Correct 15 ms 23772 KB Output is correct
6 Correct 15 ms 23860 KB Output is correct
7 Correct 15 ms 23764 KB Output is correct
8 Correct 13 ms 23820 KB Output is correct
9 Correct 15 ms 23764 KB Output is correct
10 Correct 12 ms 23848 KB Output is correct
11 Correct 12 ms 23740 KB Output is correct
12 Correct 12 ms 23820 KB Output is correct
13 Correct 12 ms 23780 KB Output is correct
14 Correct 11 ms 23856 KB Output is correct
15 Correct 12 ms 23764 KB Output is correct
16 Correct 12 ms 23764 KB Output is correct
17 Correct 16 ms 23764 KB Output is correct
18 Correct 11 ms 23764 KB Output is correct
19 Correct 15 ms 23864 KB Output is correct
20 Correct 14 ms 23804 KB Output is correct
21 Correct 15 ms 23764 KB Output is correct
22 Correct 13 ms 23784 KB Output is correct
23 Correct 12 ms 23764 KB Output is correct
24 Correct 12 ms 23764 KB Output is correct

Subtask #2
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 23764 KB Output is correct
2 Correct 13 ms 23812 KB Output is correct
3 Correct 12 ms 23824 KB Output is correct
4 Correct 12 ms 23856 KB Output is correct
5 Correct 15 ms 23772 KB Output is correct
6 Correct 15 ms 23860 KB Output is correct
7 Correct 15 ms 23764 KB Output is correct
8 Correct 13 ms 23820 KB Output is correct
9 Correct 15 ms 23764 KB Output is correct
10 Correct 12 ms 23848 KB Output is correct
11 Correct 12 ms 23740 KB Output is correct
12 Correct 12 ms 23820 KB Output is correct
13 Correct 12 ms 23780 KB Output is correct
14 Correct 11 ms 23856 KB Output is correct
15 Correct 12 ms 23764 KB Output is correct
16 Correct 12 ms 23764 KB Output is correct
17 Correct 16 ms 23764 KB Output is correct
18 Correct 11 ms 23764 KB Output is correct
19 Correct 15 ms 23864 KB Output is correct
20 Correct 14 ms 23804 KB Output is correct
21 Correct 15 ms 23764 KB Output is correct
22 Correct 13 ms 23784 KB Output is correct
23 Correct 12 ms 23764 KB Output is correct
24 Correct 12 ms 23764 KB Output is correct
25 Incorrect 12 ms 23844 KB Output isn't correct
26 Halted 0 ms 0 KB -

Subtask #3
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 23764 KB Output is correct
2 Correct 13 ms 23812 KB Output is correct
3 Correct 12 ms 23824 KB Output is correct
4 Correct 12 ms 23856 KB Output is correct
5 Correct 15 ms 23772 KB Output is correct
6 Correct 15 ms 23860 KB Output is correct
7 Correct 15 ms 23764 KB Output is correct
8 Correct 13 ms 23820 KB Output is correct
9 Correct 15 ms 23764 KB Output is correct
10 Correct 12 ms 23848 KB Output is correct
11 Correct 12 ms 23740 KB Output is correct
12 Correct 12 ms 23820 KB Output is correct
13 Correct 12 ms 23780 KB Output is correct
14 Correct 11 ms 23856 KB Output is correct
15 Correct 12 ms 23764 KB Output is correct
16 Correct 12 ms 23764 KB Output is correct
17 Correct 16 ms 23764 KB Output is correct
18 Correct 11 ms 23764 KB Output is correct
19 Correct 15 ms 23864 KB Output is correct
20 Correct 14 ms 23804 KB Output is correct
21 Correct 15 ms 23764 KB Output is correct
22 Correct 13 ms 23784 KB Output is correct
23 Correct 12 ms 23764 KB Output is correct
24 Correct 12 ms 23764 KB Output is correct
25 Incorrect 14 ms 23860 KB Output isn't correct
26 Halted 0 ms 0 KB -

Subtask #4
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 37308 KB Output is correct
2 Correct 71 ms 39420 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

# Verdict Execution time Memory Grader output
1 Correct 13 ms 23764 KB Output is correct
2 Correct 13 ms 23812 KB Output is correct
3 Correct 12 ms 23824 KB Output is correct
4 Correct 12 ms 23856 KB Output is correct
5 Correct 15 ms 23772 KB Output is correct
6 Correct 15 ms 23860 KB Output is correct
7 Correct 15 ms 23764 KB Output is correct
8 Correct 13 ms 23820 KB Output is correct
9 Correct 15 ms 23764 KB Output is correct
10 Correct 12 ms 23848 KB Output is correct
11 Correct 12 ms 23740 KB Output is correct
12 Correct 12 ms 23820 KB Output is correct
13 Correct 12 ms 23780 KB Output is correct
14 Correct 11 ms 23856 KB Output is correct
15 Correct 12 ms 23764 KB Output is correct
16 Correct 12 ms 23764 KB Output is correct
17 Correct 16 ms 23764 KB Output is correct
18 Correct 11 ms 23764 KB Output is correct
19 Correct 15 ms 23864 KB Output is correct
20 Correct 14 ms 23804 KB Output is correct
21 Correct 15 ms 23764 KB Output is correct
22 Correct 13 ms 23784 KB Output is correct
23 Correct 12 ms 23764 KB Output is correct
24 Correct 12 ms 23764 KB Output is correct
25 Incorrect 12 ms 23844 KB Output isn't correct
26 Halted 0 ms 0 KB -