oj.uz

Submission #757143

# Submission time Handle Problem Language Result Execution time Memory
757143 2023-06-12T17:30:35 Z Sam_a17 Spring cleaning (CEOI20_cleaning) C++17
54 / 100
 525 ms 39988 KB 
#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
// #include <atcoder/all>
#include <cstdio>
using namespace std;
 
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
 
#define sz(x) (int((x).size()))
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
 
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
#define ll long long
 
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
void print(long double t) {cerr << t;}
 
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T> void print(T v[],T n) {cerr << "["; for(int i = 0; i < n; i++) {cerr << v[i] << " ";} cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// for random generations
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
// mt19937 myrand(131);
 
// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
 
long long ka() {
	long long x = 0;
	bool z = false;
	while (1)
	{
		char y = getchar();
		if (y == '-')
			z = true;
		else if ('0' <= y && y <= '9')
			x = x * 10 + y - '0';
		else
		{
			if (z)
				x *= -1;
			return x;
		}
	}
}
 
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
  fastIO();
 
  // if (str != "") {
  //   freopen((str + ".in").c_str(), "r", stdin);
  //   freopen((str + ".out").c_str(), "w", stdout);
  // }else {
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
  // }
}
 
// Indexed Set
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const int N = 5e5 + 10, M = 7e6 + 10;
vector<int> adj[N];
int n, q, deg[N];
 
int dp[N][3];
int add[N], depth[N];
int two[N];
bool is_leaf[N];
 
int sz[N], id[N], tp[N], p[N], dep[N];
struct node {
  long long ones, twos, lazy;
};
 
node combine(node a, node b) {
  a.ones += b.ones;
  a.twos += b.twos;
  assert(a.lazy == 0);
  assert(b.lazy == 0);
  a.lazy = 0;
  return a;
}
 
struct segTree {
 
  vector<node> tree;
  int size = 1;
 
  void propagate(int x, int lx, int rx) {
    if(rx - lx == 1 || tree[x].lazy % 2 == 0) {
      tree[x].lazy = 0;
      return;
    }
 
    int mid = (lx + rx) / 2;
 
    tree[2 * x + 1].lazy += tree[x].lazy;
    swap(tree[2 * x + 1].ones, tree[2 * x + 1].twos);
 
    tree[2 * x + 2].lazy += tree[x].lazy;
    swap(tree[2 * x + 2].ones, tree[2 * x + 2].twos);
 
    tree[x].lazy = 0;
  }
 
  void init(long long s) {
    while(size < s) {
      size *= 2;
    }
    tree.assign(2 * size - 1, {0, 0, 0});
  }
 
  void upd(int l, int r, long long value, int x, int lx, int rx) {
    propagate(x, lx, rx);
    if(lx >= r || rx <= l) {
      return;
    }
 
    if(lx >= l && rx <= r) {
      if(value % 2 == 1) {
        swap(tree[x].ones, tree[x].twos);
      }
      tree[x].lazy += value;
      propagate(x, lx, rx);
      return;
    }
 
    int mid = (lx + rx) / 2;
    upd(l, r, value, 2 * x + 1, lx, mid);
    upd(l, r, value, 2 * x + 2, mid, rx);
    tree[x] = combine(tree[2 * x + 1], tree[2 * x + 2]);
  }
 
  void upd(int l, int r, long long value) {
    upd(l, r, value, 0, 0, size);
  }
 
  void upd2(int l, int r, long long value, int x, int lx, int rx) {
    propagate(x, lx, rx);
    if(lx >= r || rx <= l) {
      return;
    }
 
    if(lx >= l && rx <= r) {
      if(value == 1) {
        tree[x].ones = 1;
      } else {
        tree[x].twos = 1;
      }
      tree[x].lazy = 0;
      propagate(x, lx, rx);
      return;
    }
 
    int mid = (lx + rx) / 2;
    upd2(l, r, value, 2 * x + 1, lx, mid);
    upd2(l, r, value, 2 * x + 2, mid, rx);
    tree[x] = combine(tree[2 * x + 1], tree[2 * x + 2]);
  }
 
  void upd2(int l, int r, long long value) {
    upd2(l, r, value, 0, 0, size);
  }
 
  node qry(int l, int r, int x, int lx, int rx) {
    propagate(x, lx, rx);
    if(lx >= r || rx <= l) {
      return {0, 0, 0};
    }
 
    if(lx >= l && rx <= r) {
      return tree[x];
    }
 
    int mid = (lx + rx) / 2;
    node s1 = qry(l, r, 2 * x + 1, lx, mid);
    node s2 = qry(l, r, 2 * x + 2, mid, rx);
    return combine(s1, s2);
  }
 
  node qry(int l, int r) {
    return qry(l, r, 0, 0, size);
  }
};
 
segTree seg;
 
int dfs_sz(int cur, int par) {
	sz[cur] = 1;
	p[cur] = par;
	for (int chi : adj[cur]) {
		if (chi == par) continue;
		dep[chi] = dep[cur] + 1;
		p[chi] = cur;
		sz[cur] += dfs_sz(chi, cur);
	}
	return sz[cur];
}
 
int ct = 1;
 
void dfs_hld(int cur, int par, int top) {
	id[cur] = ct++;
	tp[cur] = top;
 
  if(dp[cur][2] != -1) {
    seg.upd2(id[cur], id[cur] + 1, 2);
  } else {
    seg.upd2(id[cur], id[cur] + 1, 1);
  }
 
 
	int h_chi = -1, h_sz = -1;
	for (int chi : adj[cur]) {
		if (chi == par) continue;
		if (sz[chi] > h_sz) {
			h_sz = sz[chi];
			h_chi = chi;
		}
	}
	if (h_chi == -1) return;
	dfs_hld(h_chi, cur, top);
	for (int chi : adj[cur]) {
		if (chi == par || chi == h_chi) continue;
		dfs_hld(chi, cur, chi);
	}
}
 
node path(int x, int y) {
	node answ = {0, 0, 0};
	while (tp[x] != tp[y]) {
		answ = combine(answ, seg.qry(id[tp[x]], id[x] + 1));
		x = p[tp[x]];
	}

  if(id[y] <= id[x]) {
    answ = combine(answ, seg.qry(id[y], id[x] + 1));
  } else {
    assert(false);
    answ = combine(answ, seg.qry(id[x], id[y]));
  }
	return answ;
}

 
void change_path(int a, int b) {
  while(tp[a] != tp[b]) {
    seg.upd(id[tp[a]], id[a] + 1, 1);
    a = p[tp[a]];
  }
  if(id[b] <= id[a]) {
    seg.upd(id[b], id[a] + 1, 1);
  } else {
    assert(false);
    seg.upd(id[a], id[b], 1);
  }
}
 
void dfs(int node, int parent) {
  dp[node][1] = dp[node][2] = -1;
 
  int cnt = 0;
  for(auto i: adj[node]) {
    if(i == parent) continue;
    cnt++;
    dfs(i, node);
  }
 
  cnt += add[node];
 
  if(!cnt) {
    dp[node][1] = 0;
    is_leaf[node] = 1;
  } else {
    long long s = 0, c = 0;
    for(auto i: adj[node]) {
      if(i == parent) continue;
 
      if(dp[i][1] != -1) {
        c += 1;
        s += dp[i][1] + 1;
      } else if(dp[i][2] != -1) {
        c += 2;
        s += dp[i][2] + 2;
      }
    }
 
    s += add[node];
    c += add[node];
 
    if(c & 1) {
      dp[node][1] = s;
    } else {
      dp[node][2] = s;
    }
  }
 
  add[node] = 0;
}
 
void dfs2(int node, int parent) {
  if(parent) {
    two[node] += two[parent];
    depth[node] = depth[parent] + 1;
    if(dp[node][2] != -1) {
      two[node]++;
    }  
  }
  
  for(auto i: adj[node]) {
    if(i == parent) continue;
    dfs2(i, node);
  }
}
 
int slv(int start, int a) {
  int ans = dp[start][1];
  for(int i = 1; i <= 1; i++) {
 
    if(is_leaf[a]) {
      
      if(dp[start][2] == -1) {
        ans = -1;
      } else {
        ans = dp[start][2] + 1;
      }
 
      break;
    } else if(ans == -1) {
      break;
    }
 
    ans += 1;
    ans -= two[a];
    ans += depth[a] - two[a];
  }
 
  return ans;
}
 
void solve_() {
  cin >> n >> q;
 
  for(int i = 1; i <= n - 1; i++) {
    int a, b; 
    cin >> a >> b;
    adj[a].push_back(b);
    adj[b].push_back(a);
 
    deg[a]++, deg[b]++;
  }
 
  int start = -1;
  for(int i = 1; i <= n; i++) {
    if(deg[i] > 1) {
      start = i;
      break;
    }
  }
 
  seg.init(2 * n + 10);
  dfs(start, 0);
  dfs2(start, 0);
  dfs_sz(start, 0);
  dfs_hld(start, 0, 1);
 
  while(q--) {
    int d;
    cin >> d;
 
    long long cur = 0, ans = 0;
    if(dp[start][1] != -1) {
      ans = dp[start][1];
      cur = 1;
    } else {
      ans = dp[start][2];
      cur = 2;
    }
 
    vector<int> vec;
    vector<pair<int, int>> don;
    int ok = 0;
    for(int i = 1; i <= d; i++) {
      int a; cin >> a;
      vec.push_back(a);
      deg[a]++;
 
      if(a == start) {
        ans += 1;
        change_path(a, start);
        don.push_back({a, start});
        cur++;
        continue;
      } else if(deg[a] == 2) {
        ans += 1;
        continue;
      }
 
      cur++;
 
      auto u = path(a, start);
      auto uu = path(start, start);
      assert(uu.ones <= 1);
      assert(uu.twos <= 1);
      assert((uu.ones + uu.twos) == 1);
 
      u.ones -= uu.ones;
      u.twos -= uu.twos;

      assert(u.ones + u.twos >= depth[a]);
 
      ans += 1;
      ans -= u.twos;
      ans += u.ones;
 
      change_path(a, start);
      don.push_back({a, start});
    }
 
    if(cur % 2 == 1) { 
      cout << -1 << '\n';
    } else {
      cout << ans << '\n';
    }
 
    for(auto i: vec) {
      deg[i]--;
    }
 
    for(auto i: don) {
      change_path(i.first, i.second);
    }
  }
}
 
int main() {
  setIO();
 
  auto solve = [&](int test_case)-> void {
    while(test_case--) {
      solve_();
    }
  };
 
  int test_cases = 1; 
  // cin >> test_cases;
  solve(test_cases);
 
  return 0;
}

Compilation message

cleaning.cpp: In member function 'void segTree::propagate(int, int, int)':
cleaning.cpp:133:9: warning: unused variable 'mid' [-Wunused-variable]
  133 |     int mid = (lx + rx) / 2;
      |         ^~~
cleaning.cpp: In function 'void solve_()':
cleaning.cpp:420:9: warning: unused variable 'ok' [-Wunused-variable]
  420 |     int ok = 0;
      |         ^~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 12116 KB Output is correct
2 Correct 239 ms 16968 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 134 ms 14264 KB Output is correct
2 Correct 137 ms 14272 KB Output is correct
3 Correct 101 ms 32828 KB Output is correct
4 Correct 166 ms 31624 KB Output is correct
5 Correct 175 ms 33804 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 168 ms 15180 KB Output is correct
2 Correct 155 ms 15184 KB Output is correct
3 Correct 119 ms 39948 KB Output is correct
4 Correct 375 ms 39988 KB Output is correct
5 Correct 107 ms 38504 KB Output is correct

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 202 ms 17492 KB Output is correct
2 Correct 95 ms 16856 KB Output is correct
3 Correct 26 ms 16772 KB Output is correct
4 Correct 26 ms 17388 KB Output is correct
5 Correct 28 ms 17524 KB Output is correct
6 Incorrect 122 ms 17348 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 333 ms 29872 KB Output is correct
2 Correct 523 ms 29732 KB Output is correct
3 Correct 410 ms 21068 KB Output is correct
4 Correct 525 ms 29860 KB Output is correct
5 Correct 523 ms 29732 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 454 ms 32972 KB Output is correct
2 Correct 284 ms 35680 KB Output is correct
3 Correct 374 ms 35760 KB Output is correct
4 Correct 403 ms 35168 KB Output is correct

Subtask #7
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 12116 KB Output is correct
2 Correct 239 ms 16968 KB Output is correct
3 Correct 134 ms 14264 KB Output is correct
4 Correct 137 ms 14272 KB Output is correct
5 Correct 101 ms 32828 KB Output is correct
6 Correct 166 ms 31624 KB Output is correct
7 Correct 175 ms 33804 KB Output is correct
8 Correct 168 ms 15180 KB Output is correct
9 Correct 155 ms 15184 KB Output is correct
10 Correct 119 ms 39948 KB Output is correct
11 Correct 375 ms 39988 KB Output is correct
12 Correct 107 ms 38504 KB Output is correct
13 Correct 202 ms 17492 KB Output is correct
14 Correct 95 ms 16856 KB Output is correct
15 Correct 26 ms 16772 KB Output is correct
16 Correct 26 ms 17388 KB Output is correct
17 Correct 28 ms 17524 KB Output is correct
18 Incorrect 122 ms 17348 KB Output isn't correct
19 Halted 0 ms 0 KB -