oj.uz

Submission #756962

# Submission time Handle Problem Language Result Execution time Memory
756962 2023-06-12T11:48:09 Z Sam_a17 Spring cleaning (CEOI20_cleaning) C++17
54 / 100
 527 ms 39240 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 = 4e5 + 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;
  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;
      }
      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 a, int b) {
  node answ = {0, 0, 0};
  while(tp[a] != tp[b]) {
    node curr = seg.qry(id[tp[a]], id[a] + 1);
    answ = combine(answ, curr);
    a = p[tp[a]];
  }
 
  //
  node curr = seg.qry(id[b], id[a] + 1);
  answ = combine(answ, curr);
  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;
  // n = ka(), q = ka();

  for(int i = 1; i <= n - 1; i++) {
    int a, b; 
    // a = ka(), b = ka();
    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;
    int cr = 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, cr = a;
      vec.push_back(a);
      deg[a]++;

      if(a == start) {
        ans += 1;
        change_path(a, start);
        don.push_back({a, start});
        cur++;
        ok = 1;
        continue;
      } else if(deg[a] == 2) {
        ans += 1;
        ok = 1;
        continue;
      }

      cur++;

      auto u = path(a, start);
      auto uu = path(start, start);
      assert(uu.ones <= 1);
      assert(uu.twos <= 1);

      u.ones -= uu.ones;
      u.twos -= uu.twos;

      // assert(u.twos == two[a]);
      u.ones = depth[a] - u.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:131:9: warning: unused variable 'mid' [-Wunused-variable]
  131 |     int mid = (lx + rx) / 2;
      |         ^~~
cleaning.cpp: In function 'void solve_()':
cleaning.cpp:400:9: warning: variable 'cr' set but not used [-Wunused-but-set-variable]
  400 |     int cr = 0;
      |         ^~
cleaning.cpp:411:9: warning: variable 'ok' set but not used [-Wunused-but-set-variable]
  411 |     int ok = 0;
      |         ^~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9684 KB Output is correct
2 Correct 243 ms 14576 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 119 ms 11880 KB Output is correct
2 Correct 132 ms 11900 KB Output is correct
3 Correct 96 ms 30440 KB Output is correct
4 Correct 175 ms 29228 KB Output is correct
5 Correct 171 ms 31460 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 156 ms 12728 KB Output is correct
2 Correct 147 ms 13280 KB Output is correct
3 Correct 121 ms 38796 KB Output is correct
4 Correct 342 ms 39240 KB Output is correct
5 Correct 110 ms 37264 KB Output is correct

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 200 ms 15188 KB Output is correct
2 Correct 84 ms 14548 KB Output is correct
3 Correct 25 ms 14596 KB Output is correct
4 Correct 31 ms 15196 KB Output is correct
5 Correct 27 ms 15368 KB Output is correct
6 Incorrect 118 ms 15476 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 320 ms 27516 KB Output is correct
2 Correct 472 ms 27368 KB Output is correct
3 Correct 411 ms 18688 KB Output is correct
4 Correct 527 ms 27296 KB Output is correct
5 Correct 463 ms 27408 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 474 ms 30536 KB Output is correct
2 Correct 256 ms 33440 KB Output is correct
3 Correct 376 ms 33380 KB Output is correct
4 Correct 389 ms 32720 KB Output is correct

Subtask #7
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9684 KB Output is correct
2 Correct 243 ms 14576 KB Output is correct
3 Correct 119 ms 11880 KB Output is correct
4 Correct 132 ms 11900 KB Output is correct
5 Correct 96 ms 30440 KB Output is correct
6 Correct 175 ms 29228 KB Output is correct
7 Correct 171 ms 31460 KB Output is correct
8 Correct 156 ms 12728 KB Output is correct
9 Correct 147 ms 13280 KB Output is correct
10 Correct 121 ms 38796 KB Output is correct
11 Correct 342 ms 39240 KB Output is correct
12 Correct 110 ms 37264 KB Output is correct
13 Correct 200 ms 15188 KB Output is correct
14 Correct 84 ms 14548 KB Output is correct
15 Correct 25 ms 14596 KB Output is correct
16 Correct 31 ms 15196 KB Output is correct
17 Correct 27 ms 15368 KB Output is correct
18 Incorrect 118 ms 15476 KB Output isn't correct
19 Halted 0 ms 0 KB -