oj.uz

Submission #756997

# Submission time Handle Problem Language Result Execution time Memory
756997 2023-06-12T12:11:06 Z Sam_a17 Spring cleaning (CEOI20_cleaning) C++17
37 / 100
 1000 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);
	}
}

int ok = 0;
node path(int x, int y) {
	node answ = {0, 0, 0};
	while (tp[x] != tp[y]) {
		if (dep[tp[x]] < dep[tp[y]]) swap(x, y);
		answ = combine(answ, seg.qry(id[tp[x]], id[x] + 1));
		x = p[tp[x]];
	}
	if (dep[x] > dep[y]) swap(x, y);
	answ = combine(answ, seg.qry(id[x], id[y] + 1));
	return answ;
}

void change_path(int x, int y) {
  node answ = {0, 0, 0};
	while (tp[x] != tp[y]) {
		if (dep[tp[x]] < dep[tp[y]]) swap(x, y);
		// answ = combine(answ, seg.qry(id[tp[x]], id[x] + 1));
    seg.upd(id[tp[x]], id[x] + 1, 1);
		x = p[tp[x]];
	}
	if (dep[x] > dep[y]) swap(x, y);
	// answ = combine(answ, seg.qry(id[x], id[y] + 1));
  seg.upd(id[x], id[y] + 1, 1);
	// return answ;
}


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 uu = path(start, start);

      ok = 0;
      auto u = path(a, 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:132:9: warning: unused variable 'mid' [-Wunused-variable]
  132 |     int mid = (lx + rx) / 2;
      |         ^~~
cleaning.cpp: In function 'void change_path(int, int)':
cleaning.cpp:280:8: warning: unused variable 'answ' [-Wunused-variable]
  280 |   node answ = {0, 0, 0};
      |        ^~~~
cleaning.cpp: In function 'void solve_()':
cleaning.cpp:417:9: warning: variable 'ok' set but not used [-Wunused-but-set-variable]
  417 |     int ok = 0;
      |         ^~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 12116 KB Output is correct
2 Correct 262 ms 16844 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 164 ms 14412 KB Output is correct
2 Correct 137 ms 14420 KB Output is correct
3 Correct 101 ms 32704 KB Output is correct
4 Correct 174 ms 31556 KB Output is correct
5 Correct 190 ms 33768 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 163 ms 15168 KB Output is correct
2 Correct 180 ms 15172 KB Output is correct
3 Correct 116 ms 39912 KB Output is correct
4 Correct 314 ms 39988 KB Output is correct
5 Correct 105 ms 38436 KB Output is correct

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 213 ms 17492 KB Output is correct
2 Correct 98 ms 16852 KB Output is correct
3 Correct 25 ms 16756 KB Output is correct
4 Execution timed out 1087 ms 17440 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 346 ms 29932 KB Output is correct
2 Correct 505 ms 29852 KB Output is correct
3 Correct 452 ms 21080 KB Output is correct
4 Correct 529 ms 29740 KB Output is correct
5 Correct 504 ms 29716 KB Output is correct

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 415 ms 32908 KB Output is correct
2 Correct 252 ms 35584 KB Output is correct
3 Execution timed out 1091 ms 35456 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #7
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 12116 KB Output is correct
2 Correct 262 ms 16844 KB Output is correct
3 Correct 164 ms 14412 KB Output is correct
4 Correct 137 ms 14420 KB Output is correct
5 Correct 101 ms 32704 KB Output is correct
6 Correct 174 ms 31556 KB Output is correct
7 Correct 190 ms 33768 KB Output is correct
8 Correct 163 ms 15168 KB Output is correct
9 Correct 180 ms 15172 KB Output is correct
10 Correct 116 ms 39912 KB Output is correct
11 Correct 314 ms 39988 KB Output is correct
12 Correct 105 ms 38436 KB Output is correct
13 Correct 213 ms 17492 KB Output is correct
14 Correct 98 ms 16852 KB Output is correct
15 Correct 25 ms 16756 KB Output is correct
16 Execution timed out 1087 ms 17440 KB Time limit exceeded
17 Halted 0 ms 0 KB -