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Submission #419869

# Submission time Handle Problem Language Result Execution time Memory
419869 2021-06-07T14:48:57 Z flappybird Simurgh (IOI17_simurgh) C++14
30 / 100
 3000 ms 5692 KB 
#include "simurgh.h"

#include <bits/stdc++.h>
#include <cassert>
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2,fma")
using namespace std;
typedef int ll;

#define MAX 1010
#define MAXS 10

ll N, M;
ll sp[MAX][MAXS];
ll depth[MAX];
vector<ll> adj[MAX], tree[MAX], back[MAX], ans[MAX];
vector<ll> query;
vector<ll> U, V;
ll vis[MAX];
bool ck[MAX];
ll isroyal[MAX];
ll treeres;
ll leaf[MAX];
ll adj2[MAX][MAX];
vector<ll> leafv;

void dfs(ll x = 0, ll p = -1, ll d = 0) {
	sp[x][0] = p;
	depth[x] = d;
	ll i;
	vis[x] = 1;
	for (i = 1; i < MAXS; i++) sp[x][i] = sp[sp[x][i - 1]][i - 1];
	for (auto v : adj[x]) if (!vis[v]) dfs(v, x, d + 1);
}
//{a, b}={c, d}인지 체크
bool chk(ll a, ll b, ll c, ll d) {
	if (a > b) swap(a, b);
	if (c > d) swap(c, d);
	return a == c && b == d;
}

ll getline(ll u, ll v) {
	ll i;
	for (i = 0; i < M; i++) if (chk(u, v, U[i], V[i])) return i;
	assert(0);
}

ll getline(ll i) {
	return getline(U[i], V[i]);
}

ll lca(ll u, ll v) {
	if (depth[u] != depth[v]) {
		if (depth[u] < depth[v]) swap(u, v);
		ll i;
		for (i = MAXS - 1; i >= 0; i--) if (depth[sp[u][i]] >= depth[v]) u = sp[u][i];
	}
	if (u == v) return u;
	ll i;
	for (i = MAXS - 1; i >= 0; i--) if (sp[u][i] != sp[v][i]) u = sp[u][i], v = sp[v][i];
	return sp[v][0];
}

ll dis(ll u, ll v) {
	return depth[u] + depth[v] - 2 * depth[lca(u, v)];
}

void erase(vector<ll>& v, ll a) {
	ll i;
	for (i = 0; i < v.size(); i++) if (v[i] == a) break;
	v.erase((v.begin() + i));
}

ll p(ll r, ll x) {
	if (lca(r, x) == x) {
		for (auto v : adj[x]) {
			if (lca(v, r) == v && lca(x, v) == x) return v;
		}
	}
	else return sp[x][0];
}

ll a(ll i) {
	if (sp[U[i]][0] == V[i]) return U[i];
	else return V[i];
}

//v is parent
std::vector<int> find_roads(int n, std::vector<int> u, std::vector<int> v) {
	ll cnt = 0;
	N = n, M = u.size();
	if (M == N - 1) {
		ll i;
		vector<ll> v;
		for (i = 0; i < M; i++) v.push_back(i);
		return v;
	}
	ll i;
	for (i = 0; i < M; i++) adj[u[i]].push_back(v[i]), adj[v[i]].push_back(u[i]);
	dfs();
	for (i = 0; i < M; i++) {
		if (lca(u[i], v[i]) == u[i]) swap(u[i], v[i]);
		if (sp[u[i]][0] == v[i]) tree[u[i]].push_back(v[i]), tree[v[i]].push_back(u[i]);
		else back[u[i]].push_back(v[i]), back[v[i]].push_back(u[i]);
	}
	U = u, V = v;
	for (i = 0; i < N; i++) {
		for (auto v : tree[i]) {
			if (i < v) query.push_back(getline(i, v));
		}
	}
	cnt++;
	assert(cnt <= 29998);
	treeres = count_common_roads(query);
	ll k, m;
	vector<ll> ans;
	for (k = 0; k < N; k++) isroyal[k] = -1;
	for (k = 0; k < N; k++) {
		for (m = 0; m < back[k].size(); m++) {
			ll v1 = k, v2 = back[k][m];
			ll l = lca(v1, v2);
			ll x = -1;
			ll c = 1;
			for (i = v1; i != l; i = sp[i][0]) {
				if (isroyal[i] != -1) x = i;
				else c = 0;
			}
			for (i = v2; i != l; i = sp[i][0]) {
				if (isroyal[i] != -1) x = i;
				else c = 0;
			}
			if (c) continue;
			if (x != -1) {
				query.push_back(getline(v1, v2));
				erase(query, getline(x, sp[x][0]));
				cnt++;
				assert(cnt <= 29998);
				ll q = count_common_roads(query);
				ll chk = 0;
				if (q + isroyal[x] - treeres) ans.push_back(getline(v1, v2)), chk = 1;
				adj2[v1][v2] = adj2[v2][v1] = 1;
				query.push_back(getline(x, sp[x][0]));
				for (i = v1; i != l; i = sp[i][0]) {
					if (isroyal[i] != -1) continue;
					erase(query, getline(i, sp[i][0]));
					cnt++;
					assert(cnt <= 29998);
					ll res = count_common_roads(query);
					if (treeres - (res - chk)) isroyal[i] = 1;
					else isroyal[i] = 0;
					query.push_back(getline(i, sp[i][0]));
				}
				for (i = v2; i != l; i = sp[i][0]) {
					if (isroyal[i] != -1) continue;
					erase(query, getline(i, sp[i][0]));
					cnt++;
					assert(cnt <= 29998);
					ll res = count_common_roads(query);
					if (treeres - (res - chk)) isroyal[i] = 1;
					else isroyal[i] = 0;
					query.push_back(getline(i, sp[i][0]));
				}
				erase(query, getline(v1, v2));
			}
			else {
				query.push_back(getline(v1, v2));
				map<ll, ll> mp;
				for (ll j = v1; (j != l); j = sp[j][0]) {
					ll e = getline(j, sp[j][0]);
					erase(query, e);
					cnt++;
					assert(cnt <= 29998);
					ll res = count_common_roads(query) - treeres;
					mp[j] = res;
					query.push_back(e);
				}
				for (ll j = v2; (j != l); j = sp[j][0]) {
					ll e = getline(j, sp[j][0]);
					erase(query, e);
					cnt++;
					assert(cnt <= 29998);
					ll res = count_common_roads(query) - treeres;
					mp[j] = res;
					query.push_back(e);
				}
				erase(query, getline(v1, v2));
				set<ll> st;
				for (ll j = v1; (j != l); j = sp[j][0]) st.insert(mp[j]);
				for (ll j = v2; (j != l); j = sp[j][0]) st.insert(mp[j]);
				if (st.size() == 1) {
					if (*st.begin() >= 0) {
						for (ll j = v1; (j != l); j = sp[j][0]) isroyal[j] = 0;
						for (ll j = v2; (j != l); j = sp[j][0]) isroyal[j] = 0;
					}
					else {
						for (ll j = v1; (j != l); j = sp[j][0]) isroyal[j] = 1;
						for (ll j = v2; (j != l); j = sp[j][0]) isroyal[j] = 1;
					}
				}
				else {
					if (*st.begin() == -1) {
						for (ll j = v1; (j != l); j = sp[j][0]) isroyal[j] = -mp[j];
						for (ll j = v2; (j != l); j = sp[j][0]) isroyal[j] = -mp[j];
					}
					else {
						for (ll j = v1; (j != l); j = sp[j][0]) isroyal[j] = 1 - mp[j];
						for (ll j = v2; (j != l); j = sp[j][0]) isroyal[j] = 1 - mp[j];
					}
				}
			}
		}
	};
	for (i = 1; i < N; i++) if (isroyal[i]) isroyal[i] = 1;
	//assert(cnt <= 3 * N);
	for (i = 1; i < N; i++) if (isroyal[i] == 1) ans.push_back(getline(i, sp[i][0]));
	for (i = 0; i < N; i++) {
		// idk means I don't know
		vector<ll> idk;
		for (auto x : adj[i]) {
			if (p(i, x) == i) continue;
			if (adj2[x][i]) continue;
			idk.push_back(x);
			/*
			erase(query, getline(x, p(i, x)));
			ll e = getline(i, x);
			query.push_back(e);
			cnt++;
			assert(cnt <= 29998);
			ll res = count_common_roads(query) + isroyal[a(getline(x, p(i, x)))] - treeres;
			query.push_back(getline(x, p(i, x)));
			erase(query, e);
			adj2[i][x] = adj2[x][i] = 1;
			if (res == 1) ans.push_back(e);
			*/
		}
		ll q;
		ll sum = 0;
		for (q = 0; q < idk.size(); q++) {
			erase(query, getline(idk[q], p(i, idk[q])));
			query.push_back(getline(i, idk[q]));
			sum += isroyal[a(getline(idk[q], p(i, idk[q])))];
		}
		ll total = count_common_roads(query) + sum - treeres;
		for (q = 0; q < idk.size(); q++) {
			query.push_back(getline(idk[q], p(i, idk[q])));
			erase(query, getline(i, idk[q]));
		}
		while (total) {
			ll l, r;
			l = 0, r = idk.size() - 1;
			ll mid;
			while (l < r) {
				mid = (l + r) / 2;
				ll q;
				ll sum = 0;
				for (q = l; q <= mid; q++) {
					erase(query, getline(idk[q], p(i, idk[q])));
					query.push_back(getline(i, idk[q]));
					sum += isroyal[a(getline(idk[q], p(i, idk[q])))];
				}
				ll res = count_common_roads(query) + sum - treeres;
				for (q = l; q <= mid; q++) {
					query.push_back(getline(idk[q], p(i, idk[q])));
					erase(query, getline(i, idk[q]));
				}
				if (res > 0) r = mid;
				else l = mid + 1;
			}
			ll x = idk[l];
			adj2[i][x] = adj2[x][i] = 1;
			ans.push_back(getline(i, x));
			erase(idk, x);
			total--;
		}
		for (auto qq : idk) adj2[i][qq] = adj2[qq][i] = 1;
	}
	sort(ans.begin(), ans.end());
	ans.erase(unique(ans.begin(), ans.end()), ans.end());
	assert(ans.size() == N - 1);
	return ans;
}

Compilation message

simurgh.cpp: In function 'void erase(std::vector<int>&, ll)':
simurgh.cpp:72:16: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |  for (i = 0; i < v.size(); i++) if (v[i] == a) break;
      |              ~~^~~~~~~~~~
simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:121:17: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  121 |   for (m = 0; m < back[k].size(); m++) {
      |               ~~^~~~~~~~~~~~~~~~
simurgh.cpp:240:17: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  240 |   for (q = 0; q < idk.size(); q++) {
      |               ~~^~~~~~~~~~~~
simurgh.cpp:246:17: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  246 |   for (q = 0; q < idk.size(); q++) {
      |               ~~^~~~~~~~~~~~
In file included from /usr/include/c++/10/cassert:44,
                 from simurgh.cpp:4:
simurgh.cpp:281:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'int'} [-Wsign-compare]
  281 |  assert(ans.size() == N - 1);
      |         ~~~~~~~~~~~^~~~~~~~
simurgh.cpp: In function 'll p(ll, ll)':
simurgh.cpp:83:1: warning: control reaches end of non-void function [-Wreturn-type]
   83 | }
      | ^

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB correct
2 Correct 1 ms 332 KB correct
3 Correct 1 ms 332 KB correct
4 Correct 1 ms 332 KB correct
5 Correct 1 ms 332 KB correct
6 Correct 1 ms 332 KB correct
7 Correct 0 ms 332 KB correct
8 Correct 1 ms 332 KB correct
9 Correct 1 ms 332 KB correct
10 Correct 1 ms 332 KB correct
11 Correct 1 ms 332 KB correct
12 Correct 1 ms 332 KB correct
13 Correct 1 ms 332 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB correct
2 Correct 1 ms 332 KB correct
3 Correct 1 ms 332 KB correct
4 Correct 1 ms 332 KB correct
5 Correct 1 ms 332 KB correct
6 Correct 1 ms 332 KB correct
7 Correct 0 ms 332 KB correct
8 Correct 1 ms 332 KB correct
9 Correct 1 ms 332 KB correct
10 Correct 1 ms 332 KB correct
11 Correct 1 ms 332 KB correct
12 Correct 1 ms 332 KB correct
13 Correct 1 ms 332 KB correct
14 Correct 17 ms 672 KB correct
15 Correct 14 ms 664 KB correct
16 Correct 16 ms 588 KB correct
17 Correct 12 ms 588 KB correct
18 Correct 3 ms 588 KB correct
19 Correct 12 ms 588 KB correct
20 Correct 11 ms 664 KB correct
21 Correct 9 ms 656 KB correct
22 Correct 5 ms 588 KB correct
23 Correct 4 ms 588 KB correct
24 Correct 4 ms 636 KB correct
25 Correct 1 ms 588 KB correct
26 Correct 4 ms 588 KB correct
27 Correct 4 ms 588 KB correct
28 Correct 2 ms 588 KB correct
29 Correct 1 ms 588 KB correct
30 Correct 4 ms 588 KB correct
31 Correct 4 ms 636 KB correct
32 Correct 4 ms 588 KB correct
33 Correct 4 ms 588 KB correct

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB correct
2 Correct 1 ms 332 KB correct
3 Correct 1 ms 332 KB correct
4 Correct 1 ms 332 KB correct
5 Correct 1 ms 332 KB correct
6 Correct 1 ms 332 KB correct
7 Correct 0 ms 332 KB correct
8 Correct 1 ms 332 KB correct
9 Correct 1 ms 332 KB correct
10 Correct 1 ms 332 KB correct
11 Correct 1 ms 332 KB correct
12 Correct 1 ms 332 KB correct
13 Correct 1 ms 332 KB correct
14 Correct 17 ms 672 KB correct
15 Correct 14 ms 664 KB correct
16 Correct 16 ms 588 KB correct
17 Correct 12 ms 588 KB correct
18 Correct 3 ms 588 KB correct
19 Correct 12 ms 588 KB correct
20 Correct 11 ms 664 KB correct
21 Correct 9 ms 656 KB correct
22 Correct 5 ms 588 KB correct
23 Correct 4 ms 588 KB correct
24 Correct 4 ms 636 KB correct
25 Correct 1 ms 588 KB correct
26 Correct 4 ms 588 KB correct
27 Correct 4 ms 588 KB correct
28 Correct 2 ms 588 KB correct
29 Correct 1 ms 588 KB correct
30 Correct 4 ms 588 KB correct
31 Correct 4 ms 636 KB correct
32 Correct 4 ms 588 KB correct
33 Correct 4 ms 588 KB correct
34 Execution timed out 3074 ms 2572 KB Time limit exceeded
35 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB correct
2 Correct 1 ms 332 KB correct
3 Execution timed out 3077 ms 5692 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB correct
2 Correct 1 ms 332 KB correct
3 Correct 1 ms 332 KB correct
4 Correct 1 ms 332 KB correct
5 Correct 1 ms 332 KB correct
6 Correct 1 ms 332 KB correct
7 Correct 0 ms 332 KB correct
8 Correct 1 ms 332 KB correct
9 Correct 1 ms 332 KB correct
10 Correct 1 ms 332 KB correct
11 Correct 1 ms 332 KB correct
12 Correct 1 ms 332 KB correct
13 Correct 1 ms 332 KB correct
14 Correct 17 ms 672 KB correct
15 Correct 14 ms 664 KB correct
16 Correct 16 ms 588 KB correct
17 Correct 12 ms 588 KB correct
18 Correct 3 ms 588 KB correct
19 Correct 12 ms 588 KB correct
20 Correct 11 ms 664 KB correct
21 Correct 9 ms 656 KB correct
22 Correct 5 ms 588 KB correct
23 Correct 4 ms 588 KB correct
24 Correct 4 ms 636 KB correct
25 Correct 1 ms 588 KB correct
26 Correct 4 ms 588 KB correct
27 Correct 4 ms 588 KB correct
28 Correct 2 ms 588 KB correct
29 Correct 1 ms 588 KB correct
30 Correct 4 ms 588 KB correct
31 Correct 4 ms 636 KB correct
32 Correct 4 ms 588 KB correct
33 Correct 4 ms 588 KB correct
34 Execution timed out 3074 ms 2572 KB Time limit exceeded
35 Halted 0 ms 0 KB -