oj.uz

Submission #757068

# Submission time Handle Problem Language Result Execution time Memory
757068 2023-06-12T13:44:48 Z Sam_a17 Spring cleaning (CEOI20_cleaning) C++17
37 / 100
 1000 ms 24576 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 = 2e5 + 10, M = 7e6 + 10;
vector<int> adj[N];
int n, q, deg[N];
 
int dp[N][3];
int depth[N];
bool is_leaf[N];
 
int sz[N], id[N], tp[N], p[N], dep[N];
struct node {
  int sum, ones, twos, lazy;
};
 
node combine(node a, node b) {
  a.sum += b.sum;
  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 + 1].sum = tree[2 * x + 1].ones + 2 * 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[2 * x + 2].sum = tree[2 * x + 2].ones + 2 * 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, 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].sum = tree[x].ones + 2 * 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].sum = tree[x].ones + 2 * tree[x].twos;
      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, 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);
	}
}
 
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);
    seg.upd(id[tp[x]], id[x] + 1, 1);
		x = p[tp[x]];
	}
	if (dep[x] > dep[y]) swap(x, y);
  seg.upd(id[x], id[y] + 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);
  }
 
  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;
      }
    }
 
    if(c & 1) {
      dp[node][1] = s;
    } else {
      dp[node][2] = s;
    }
  }
}
 
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(n + 2);
  dfs(start, 0);
  dfs_sz(start, 0);
  dfs_hld(start, 0, 1);
 
  while(q--) {
    int d = ka();
    long long cur = 0;
 
    if(dp[start][1] != -1) {
      cur = 1;
    } else {
      cur = 2;
    }
 
    vector<pair<int, int>> vec;
    int ok = 0;
    for(int i = 1; i <= d; i++) {
      int a = ka();
      deg[a]++;
 
      if(a == start) {
        change_path(a, start);
        vec.push_back({a, 1});
        cur++;
        continue;
      } else if(deg[a] == 2) {
        vec.push_back({a, 0});
        continue;
      }
 
      cur++;
      change_path(a, start);
      vec.push_back({a, 1});
    }
 
    if(cur % 2 == 1) { 
      cout << -1 << '\n';
    } else {
      cout << seg.qry(2, n + 1).sum + d << '\n';
    }
 
    for(auto i: vec) {
      deg[i.first]--;
      if(i.second) {
        change_path(i.first, start);
      }
    }
 
  }
}
 
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:130:9: warning: unused variable 'mid' [-Wunused-variable]
  130 |     int mid = (lx + rx) / 2;
      |         ^~~
cleaning.cpp: In function 'void change_path(int, int)':
cleaning.cpp:270:8: warning: unused variable 'answ' [-Wunused-variable]
  270 |   node answ = {0, 0, 0};
      |        ^~~~
cleaning.cpp: In function 'void solve_()':
cleaning.cpp:353:9: warning: unused variable 'ok' [-Wunused-variable]
  353 |     int ok = 0;
      |         ^~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 158 ms 8196 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 76 ms 6940 KB Output is correct
2 Correct 71 ms 6860 KB Output is correct
3 Correct 65 ms 17188 KB Output is correct
4 Correct 113 ms 16352 KB Output is correct
5 Correct 166 ms 18720 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 118 ms 7608 KB Output is correct
2 Correct 96 ms 7624 KB Output is correct
3 Correct 107 ms 24576 KB Output is correct
4 Correct 249 ms 24356 KB Output is correct
5 Correct 82 ms 23144 KB Output is correct

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 123 ms 8792 KB Output is correct
2 Correct 66 ms 7836 KB Output is correct
3 Correct 20 ms 7628 KB Output is correct
4 Execution timed out 1084 ms 8280 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 223 ms 15072 KB Output is correct
2 Correct 353 ms 14980 KB Output is correct
3 Correct 258 ms 10220 KB Output is correct
4 Correct 364 ms 15020 KB Output is correct
5 Correct 356 ms 15000 KB Output is correct

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 327 ms 18216 KB Output is correct
2 Correct 223 ms 20312 KB Output is correct
3 Execution timed out 1067 ms 19788 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #7
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 158 ms 8196 KB Output is correct
3 Correct 76 ms 6940 KB Output is correct
4 Correct 71 ms 6860 KB Output is correct
5 Correct 65 ms 17188 KB Output is correct
6 Correct 113 ms 16352 KB Output is correct
7 Correct 166 ms 18720 KB Output is correct
8 Correct 118 ms 7608 KB Output is correct
9 Correct 96 ms 7624 KB Output is correct
10 Correct 107 ms 24576 KB Output is correct
11 Correct 249 ms 24356 KB Output is correct
12 Correct 82 ms 23144 KB Output is correct
13 Correct 123 ms 8792 KB Output is correct
14 Correct 66 ms 7836 KB Output is correct
15 Correct 20 ms 7628 KB Output is correct
16 Execution timed out 1084 ms 8280 KB Time limit exceeded
17 Halted 0 ms 0 KB -