oj.uz

Submission #1105966

# Submission time Handle Problem Language Result Execution time Memory
1105966 2024-10-28T15:31:02 Z coolsentenceidontremember Regions (IOI09_regions) C++17
0 / 100
 218 ms 76272 KB 
/*


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*/



#include "bits/stdc++.h"
#define ll long long
#define ld long double
#define ff first
#define ss second
#define pii pair<int, int>
#define mp make_pair

using namespace std;

void setIO(string s = ""){
 ios_base::sync_with_stdio(false);
 cin.tie(nullptr);
 cout.tie(nullptr);
 if (!s.empty()){
	freopen((s+".in").c_str(), "r", stdin);
	freopen((s+".out").c_str(), "w", stdout);
	}
}



struct chash {
	const double PI = acos(-1);
	const uint64_t C = (2e18 * PI)+71;
	const uint32_t random = chrono::steady_clock::now().time_since_epoch().count();
	size_t operator()(ll x) const {
		return __builtin_bswap64((x^random)*C);
	} 
};



const int N = 2e5;
const int R = 25000;
int big_region_id[R];
int reg[N];
int region_cnt[R];
int precalc[505][R];
vector<int> adj[N];
int timer = 0;
vector<int> region_node[R];
int from[N], to[N];
vector<int> in_reg[R];
void dfs_precalc(int u, int cnt, const int &pRegion){
	int cur_reg = reg[u];
	if (cur_reg == pRegion) {
	//	cout << u << ' ' << pRegion << ' ' << '\n';
		cnt++;
	}
	precalc[big_region_id[pRegion]][cur_reg] += cnt;
	//int tmp = (cur_reg == pRegion);
	for (const int &v : adj[u]){
		dfs_precalc(v, cnt, pRegion);
	}
}

void dfs(int u){
	from[u] = ++timer;
	region_node[reg[u]].push_back(timer);
	in_reg[reg[u]].push_back(u);
	for (const int &v : adj[u]){
		dfs(v);
	}
	to[u] = timer;
}

int main(){
	setIO();
    int n, r, q;
    cin >> n >> r >> q;
    int big = sqrt(n) + 1;
    memset(big_region_id, -1, sizeof big_region_id);
    memset(region_cnt, 0, sizeof region_cnt);
    memset(precalc, 0, sizeof precalc);
    int first_reg;
    cin >> first_reg;
    reg[0] = --first_reg;
    region_cnt[first_reg]++;
    for (int i = 1; i < n; i++){
    	int p, rr;
    	cin >> p >> rr;
    	adj[p-1].push_back(i);
    	reg[i] = --rr;
    	region_cnt[rr]++;
	}
	int cnt = 0;
	for (int i = 0; i < r; i++){
		if (region_cnt[i] >= big) big_region_id[i] = cnt++;
	}
	for (int i = 0; i < r; i++){
		if (big_region_id[i] != -1) dfs_precalc(0, 0, i);
	}
	dfs(0);
	for (int i = 1; i <= q; i++){
		int r1, r2;
		cin >> r1 >> r2;
		r1--; r2--;
		if (big_region_id[r1] != -1) cout << precalc[big_region_id[r1]][r2];
		else {
			int ans = 0;
			for (const int &u : in_reg[r1]){
				//cout << u << ' ';
				ans += (upper_bound(region_node[r2].begin(), region_node[r2].end(), to[u]) - lower_bound(region_node[r2].begin()
				,region_node[r2].end(), from[u]));
			}
			cout << ans;
		}
		cout << '\n';
	}
	//for (int i = 0; i < r; i++)cout << big_region_id[i] << ' ';
}

Compilation message

regions.cpp: In function 'void setIO(std::string)':
regions.cpp:138:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  138 |  freopen((s+".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:139:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  139 |  freopen((s+".out").c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 15.0

# Verdict Execution time Memory Grader output
1 Execution timed out 8 ms 57936 KB Time limit exceeded (wall clock)
2 Execution timed out 7 ms 57936 KB Time limit exceeded (wall clock)
3 Execution timed out 8 ms 57936 KB Time limit exceeded (wall clock)
4 Execution timed out 8 ms 57936 KB Time limit exceeded (wall clock)
5 Execution timed out 10 ms 58192 KB Time limit exceeded (wall clock)
6 Execution timed out 8 ms 58192 KB Time limit exceeded (wall clock)
7 Execution timed out 9 ms 58192 KB Time limit exceeded (wall clock)
8 Execution timed out 8 ms 58192 KB Time limit exceeded (wall clock)
9 Execution timed out 9 ms 58448 KB Time limit exceeded (wall clock)
10 Execution timed out 13 ms 58448 KB Time limit exceeded (wall clock)
11 Execution timed out 11 ms 58704 KB Time limit exceeded (wall clock)
12 Execution timed out 11 ms 59216 KB Time limit exceeded (wall clock)
13 Execution timed out 14 ms 58704 KB Time limit exceeded (wall clock)
14 Execution timed out 15 ms 59216 KB Time limit exceeded (wall clock)
15 Execution timed out 16 ms 61776 KB Time limit exceeded (wall clock)

Subtask #2
0 / 85.0

# Verdict Execution time Memory Grader output
1 Execution timed out 47 ms 61768 KB Time limit exceeded (wall clock)
2 Execution timed out 38 ms 60744 KB Time limit exceeded (wall clock)
3 Execution timed out 29 ms 63568 KB Time limit exceeded (wall clock)
4 Execution timed out 14 ms 59472 KB Time limit exceeded (wall clock)
5 Execution timed out 19 ms 61008 KB Time limit exceeded (wall clock)
6 Execution timed out 84 ms 60488 KB Time limit exceeded (wall clock)
7 Execution timed out 92 ms 61256 KB Time limit exceeded (wall clock)
8 Execution timed out 101 ms 65776 KB Time limit exceeded (wall clock)
9 Execution timed out 44 ms 65728 KB Time limit exceeded (wall clock)
10 Execution timed out 172 ms 70492 KB Time limit exceeded (wall clock)
11 Execution timed out 58 ms 65080 KB Time limit exceeded (wall clock)
12 Execution timed out 79 ms 66632 KB Time limit exceeded (wall clock)
13 Execution timed out 59 ms 66632 KB Time limit exceeded (wall clock)
14 Execution timed out 218 ms 66480 KB Time limit exceeded (wall clock)
15 Execution timed out 59 ms 70984 KB Time limit exceeded (wall clock)
16 Execution timed out 67 ms 76272 KB Time limit exceeded (wall clock)
17 Execution timed out 106 ms 75080 KB Time limit exceeded (wall clock)