oj.uz

Submission #757135

# Submission time Handle Problem Language Result Execution time Memory
757135 2023-06-12T17:18:44 Z Sam_a17 Spring cleaning (CEOI20_cleaning) C++17
37 / 100
 574 ms 71340 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]) {
		if (dep[tp[x]] < dep[tp[y]]) {
      assert(false);
      swap(x, y);
    }
		answ = combine(answ, seg.qry(id[tp[x]], id[x] + 1));
		x = p[tp[x]];
	}

	// if (dep[x] > dep[y]) {
  //   // assert(false);
    swap(x, y);
  // }
  // dbg(make_pair(id[x], id[y]))
	assert(id[x] <= id[y]);
  answ = combine(answ, seg.qry(id[x], id[y] + 1));
	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]];
  }
  //
  seg.upd(id[b], id[a] + 1, 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;
 
      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:422:9: warning: unused variable 'ok' [-Wunused-variable]
  422 |     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 249 ms 16936 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 133 ms 14280 KB Output is correct
2 Correct 149 ms 14292 KB Output is correct
3 Correct 91 ms 32784 KB Output is correct
4 Correct 185 ms 31612 KB Output is correct
5 Correct 186 ms 33860 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 151 ms 15148 KB Output is correct
2 Correct 154 ms 15164 KB Output is correct
3 Correct 119 ms 39896 KB Output is correct
4 Correct 385 ms 40012 KB Output is correct
5 Correct 98 ms 38540 KB Output is correct

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 207 ms 17540 KB Output is correct
2 Correct 88 ms 16852 KB Output is correct
3 Correct 24 ms 16808 KB Output is correct
4 Runtime error 38 ms 35036 KB Execution killed with signal 6
5 Halted 0 ms 0 KB -

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 339 ms 29840 KB Output is correct
2 Correct 513 ms 29744 KB Output is correct
3 Correct 400 ms 20972 KB Output is correct
4 Correct 574 ms 29740 KB Output is correct
5 Correct 508 ms 29648 KB Output is correct

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 448 ms 32996 KB Output is correct
2 Correct 284 ms 35688 KB Output is correct
3 Runtime error 244 ms 71340 KB Execution killed with signal 6
4 Halted 0 ms 0 KB -

Subtask #7
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 12116 KB Output is correct
2 Correct 249 ms 16936 KB Output is correct
3 Correct 133 ms 14280 KB Output is correct
4 Correct 149 ms 14292 KB Output is correct
5 Correct 91 ms 32784 KB Output is correct
6 Correct 185 ms 31612 KB Output is correct
7 Correct 186 ms 33860 KB Output is correct
8 Correct 151 ms 15148 KB Output is correct
9 Correct 154 ms 15164 KB Output is correct
10 Correct 119 ms 39896 KB Output is correct
11 Correct 385 ms 40012 KB Output is correct
12 Correct 98 ms 38540 KB Output is correct
13 Correct 207 ms 17540 KB Output is correct
14 Correct 88 ms 16852 KB Output is correct
15 Correct 24 ms 16808 KB Output is correct
16 Runtime error 38 ms 35036 KB Execution killed with signal 6
17 Halted 0 ms 0 KB -