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Submission #1082973

# Submission time Handle Problem Language Result Execution time Memory
1082973 2024-09-02T09:13:31 Z happypotato Simurgh (IOI17_simurgh) C++17
51 / 100
 129 ms 4396 KB 
#include "simurgh.h"
#include <bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
#define ff first
#define ss second
#define pb push_back
vector<vector<pii>> adj;
vector<pii> par;
vector<int> dep;
vector<bool> vis;
vector<bool> ontree;
vector<int> ans;
int n, m;
void dfstree(int u = 1, int pp = 0, int d = 1) {
	dep[u] = d;
	vis[u] = true;
	for (pii v : adj[u]) {
		if (vis[v.ff]) continue;
		par[v.ff] = {u, v.ss};
		ontree[v.ss] = true;
		dfstree(v.ff, u, d + 1);
	}
}
set<int> qry;
void del(int x) { qry.erase(qry.find(x)); }
void add(int x) { qry.insert(x); }
int ask() {
	vector<int> r;
	for (int x : qry) r.pb(x);
	return count_common_roads(r);
}
vector<int> find_roads(int N, vector<int> U, vector<int> V) {
	n = N; m = (int)(U.size());
	adj.resize(n + 1);
	par.clear(); par.resize(n + 1, make_pair(0, 0));
	dep.clear(); dep.resize(n + 1, 0);
	vis.clear(); vis.resize(n + 1, false);
	ontree.clear(); ontree.resize(m, false);
	ans.clear(); ans.resize(m, -1);
	for (int i = 0; i < m; i++) {
		U[i]++; V[i]++;
		adj[U[i]].pb({V[i], i});
		adj[V[i]].pb({U[i], i});
	}

	dfstree();
	for (int i = 0; i < m; i++) {
		if (ontree[i]) {
			// cerr << "EDGE " << i << " ON DFS TREE" << endl;
			qry.insert(i);
		}
	}
	int INIT = ask();
	// cerr << INIT << endl;

	for (int i = 0; i < m; i++) {
		if (dep[U[i]] > dep[V[i]]) swap(U[i], V[i]);
		if (ontree[i]) continue;
		vector<int> chain;
		int cur = V[i];
		while (cur != U[i]) {
			chain.pb(par[cur].ss);
			cur = par[cur].ff;
		}
		// cerr << "edge " << i << ": ";
		// for (int x : chain) cerr << x << ' ';
		// cerr << endl;
		int len = chain.size();
		int cnt = 0;
		for (int x : chain) cnt += (ans[x] != -1);
		if (cnt == 0) {
			// everything unknown: query everything
			vector<int> res;
			add(i);
			for (int x : chain) {
				del(x);
				res.pb(ask());
				add(x);
			}
			del(i);
			// cannot be all 1s, so if all equal assign 0s
			int maxi = INIT;
			for (int x : res) maxi = max(maxi, x);
			// cerr << "checking ";
			// for (int x : chain) cerr << x << ' ';
			// cerr << ", maxi = " << maxi << endl;
			ans[i] = maxi - INIT;
			for (int i = 0; i < len; i++) {
				ans[chain[i]] = maxi - res[i];
			}
		} else if (cnt <= len) {
			// more than one known: query everything else
			pii known = {-1, -1};
			for (int x : chain) {
				if (ans[x] != -1) {
					known = {x, ans[x]};
					break;
				}
			}
			// query everything else except for this, calculate expected sum
			del(known.ff); add(i);
			int TOT = ask() + known.ss;
			add(known.ff);
			// calcuate i from TOT and INIT
			ans[i] = TOT - INIT;
			// erase every unknown edge and calculate
			for (int x : chain) {
				if (ans[x] != -1) continue;
				del(x);
				ans[x] = TOT - ask();
				add(x);
			}
			del(i);
		}
	}
	for (int i = 0; i < m; i++) {
		// check for bridges
		if (ontree[i] && ans[i] == -1) ans[i] = 1;
	}

	vector<int> edges;
	auto test = [&](int lb, int rb) -> bool {
		int expect = INIT;
		for (int i = lb; i <= rb; i++) {
			int u, v = U[edges[i]], V[edges[i]];
			// u is ancestor of v -> remove {v, par[v]}
			del(par[v].ss); expect -= ans[par[v].ss];
			add(edges[i]);
		}
		bool ret = (ask() > expect);
		for (int i = lb; i <= rb; i++) {
			int u, v = U[edges[i]], V[edges[i]];
			add(par[v].ss);
			del(edges[i]);
		}
		return ret;
	};

	// query remaining edges
	for (int u = 1; u <= n; u++) {
		edges.clear();
		for (pii v : adj[u]) {
			if (v.ff > u && ans[v.ss] == -1) edges.pb(v.ss);
		}
		if (edges.empty()) continue;
		while (test(0, (int)(edges.size()) - 1)) {
			int lb = 0, rb = (int)(edges.size()) - 1;
			while (lb < rb) {
				int mid = (lb + rb) >> 1;
				if (test(lb, mid)) rb = mid;
				else lb = mid + 1;
			}
			// edges[lb] is answer
			ans[edges[lb]] = 1;
			edges.erase(edges.begin() + lb);
		}
	}

	vector<int> fin;
	for (int i = 0; i < m; i++) {
		if (ans[i] == 1) fin.pb(i);
	}
	// cerr << "ANSWER: ";
	// for (int x : fin) cerr << x << ' ';
	// cerr << endl;
	return fin;
}

Compilation message

simurgh.cpp: In lambda function:
simurgh.cpp:126:8: warning: unused variable 'u' [-Wunused-variable]
  126 |    int u, v = U[edges[i]], V[edges[i]];
      |        ^
simurgh.cpp:126:28: warning: unused variable 'V' [-Wunused-variable]
  126 |    int u, v = U[edges[i]], V[edges[i]];
      |                            ^
simurgh.cpp:133:8: warning: unused variable 'u' [-Wunused-variable]
  133 |    int u, v = U[edges[i]], V[edges[i]];
      |        ^
simurgh.cpp:133:28: warning: unused variable 'V' [-Wunused-variable]
  133 |    int u, v = U[edges[i]], V[edges[i]];
      |                            ^

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB correct
2 Correct 0 ms 604 KB correct
3 Correct 0 ms 344 KB correct
4 Correct 0 ms 348 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 348 KB correct
9 Correct 1 ms 348 KB correct
10 Correct 0 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 1 ms 344 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB correct
2 Correct 0 ms 604 KB correct
3 Correct 0 ms 344 KB correct
4 Correct 0 ms 348 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 348 KB correct
9 Correct 1 ms 348 KB correct
10 Correct 0 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 1 ms 344 KB correct
14 Correct 2 ms 344 KB correct
15 Correct 2 ms 348 KB correct
16 Correct 2 ms 348 KB correct
17 Correct 1 ms 348 KB correct
18 Correct 1 ms 348 KB correct
19 Correct 2 ms 348 KB correct
20 Correct 2 ms 500 KB correct
21 Correct 2 ms 344 KB correct
22 Correct 1 ms 348 KB correct
23 Correct 1 ms 348 KB correct
24 Correct 1 ms 344 KB correct
25 Correct 0 ms 348 KB correct
26 Correct 1 ms 348 KB correct
27 Correct 1 ms 348 KB correct
28 Correct 1 ms 348 KB correct
29 Correct 1 ms 348 KB correct
30 Correct 2 ms 348 KB correct
31 Correct 1 ms 348 KB correct
32 Correct 1 ms 348 KB correct
33 Correct 1 ms 348 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB correct
2 Correct 0 ms 604 KB correct
3 Correct 0 ms 344 KB correct
4 Correct 0 ms 348 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 348 KB correct
9 Correct 1 ms 348 KB correct
10 Correct 0 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 1 ms 344 KB correct
14 Correct 2 ms 344 KB correct
15 Correct 2 ms 348 KB correct
16 Correct 2 ms 348 KB correct
17 Correct 1 ms 348 KB correct
18 Correct 1 ms 348 KB correct
19 Correct 2 ms 348 KB correct
20 Correct 2 ms 500 KB correct
21 Correct 2 ms 344 KB correct
22 Correct 1 ms 348 KB correct
23 Correct 1 ms 348 KB correct
24 Correct 1 ms 344 KB correct
25 Correct 0 ms 348 KB correct
26 Correct 1 ms 348 KB correct
27 Correct 1 ms 348 KB correct
28 Correct 1 ms 348 KB correct
29 Correct 1 ms 348 KB correct
30 Correct 2 ms 348 KB correct
31 Correct 1 ms 348 KB correct
32 Correct 1 ms 348 KB correct
33 Correct 1 ms 348 KB correct
34 Correct 112 ms 1624 KB correct
35 Correct 110 ms 1624 KB correct
36 Correct 76 ms 1372 KB correct
37 Correct 6 ms 348 KB correct
38 Correct 127 ms 1624 KB correct
39 Correct 105 ms 1628 KB correct
40 Correct 73 ms 1516 KB correct
41 Correct 112 ms 1532 KB correct
42 Correct 129 ms 1628 KB correct
43 Correct 62 ms 1360 KB correct
44 Correct 51 ms 856 KB correct
45 Correct 53 ms 1116 KB correct
46 Correct 40 ms 860 KB correct
47 Correct 18 ms 604 KB correct
48 Correct 2 ms 344 KB correct
49 Correct 6 ms 344 KB correct
50 Correct 17 ms 604 KB correct
51 Correct 54 ms 860 KB correct
52 Correct 45 ms 1024 KB correct
53 Correct 40 ms 860 KB correct
54 Correct 58 ms 1304 KB correct
55 Correct 56 ms 1112 KB correct
56 Correct 61 ms 1368 KB correct
57 Correct 56 ms 1116 KB correct

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB correct
2 Correct 0 ms 348 KB correct
3 Incorrect 105 ms 4396 KB WA in grader: NO
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB correct
2 Correct 0 ms 604 KB correct
3 Correct 0 ms 344 KB correct
4 Correct 0 ms 348 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 348 KB correct
9 Correct 1 ms 348 KB correct
10 Correct 0 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 1 ms 344 KB correct
14 Correct 2 ms 344 KB correct
15 Correct 2 ms 348 KB correct
16 Correct 2 ms 348 KB correct
17 Correct 1 ms 348 KB correct
18 Correct 1 ms 348 KB correct
19 Correct 2 ms 348 KB correct
20 Correct 2 ms 500 KB correct
21 Correct 2 ms 344 KB correct
22 Correct 1 ms 348 KB correct
23 Correct 1 ms 348 KB correct
24 Correct 1 ms 344 KB correct
25 Correct 0 ms 348 KB correct
26 Correct 1 ms 348 KB correct
27 Correct 1 ms 348 KB correct
28 Correct 1 ms 348 KB correct
29 Correct 1 ms 348 KB correct
30 Correct 2 ms 348 KB correct
31 Correct 1 ms 348 KB correct
32 Correct 1 ms 348 KB correct
33 Correct 1 ms 348 KB correct
34 Correct 112 ms 1624 KB correct
35 Correct 110 ms 1624 KB correct
36 Correct 76 ms 1372 KB correct
37 Correct 6 ms 348 KB correct
38 Correct 127 ms 1624 KB correct
39 Correct 105 ms 1628 KB correct
40 Correct 73 ms 1516 KB correct
41 Correct 112 ms 1532 KB correct
42 Correct 129 ms 1628 KB correct
43 Correct 62 ms 1360 KB correct
44 Correct 51 ms 856 KB correct
45 Correct 53 ms 1116 KB correct
46 Correct 40 ms 860 KB correct
47 Correct 18 ms 604 KB correct
48 Correct 2 ms 344 KB correct
49 Correct 6 ms 344 KB correct
50 Correct 17 ms 604 KB correct
51 Correct 54 ms 860 KB correct
52 Correct 45 ms 1024 KB correct
53 Correct 40 ms 860 KB correct
54 Correct 58 ms 1304 KB correct
55 Correct 56 ms 1112 KB correct
56 Correct 61 ms 1368 KB correct
57 Correct 56 ms 1116 KB correct
58 Correct 0 ms 348 KB correct
59 Correct 0 ms 348 KB correct
60 Incorrect 105 ms 4396 KB WA in grader: NO
61 Halted 0 ms 0 KB -