oj.uz

Submission #945621

# Submission time Handle Problem Language Result Execution time Memory
945621 2024-03-14T05:39:07 Z vjudge1 Amusement Park (CEOI19_amusementpark) C++17
19 / 100
 3000 ms 3672 KB 
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
 
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define int long long
#define rnd(l, r) uniform_int_distribution<int>(l, r)(rng)
 
using namespace std;
 
void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);} 
int pow(int a,int b,int m){int ans=1;while(b){if(b&1){ans=(ans*a)%m;}b>>=1;a=(a*a)%m;}return ans;}
int binpow(int a,int b){int ans=1;while(b){if(b&1){ans=(ans*a);}b>>=1;a=(a*a);}return ans;}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
const int N = 1e5 + 100, mxc = 105, inf = 1e18, MX = 1e5 + 10;

vector <int> g[N];
int vis[N];

bool f = 0;
void dfs(int v){
	if(f)return;
	vis[v] = 1;
	for(auto to : g[v]){
		if(vis[to] == 1){
			f = 1;
			return;
		}
		dfs(to);
	}
	vis[v] = 2;
}

main(){
	iostream::sync_with_stdio(false);	
    cin.tie(nullptr);
    cout.tie(nullptr);
    int n, m;
    cin >> n >> m;
    vector <pair <int,int> > vp;
    for(int i=  1; i <= m; i++){
		int a, b;
		cin >> a >> b;
		vp.pb({a, b});
	}
	int ans = 0;
	for(int bit = 0; bit < (1 << m); bit++){
		
		for(int i = 0; i < m; i++){
			if(bit & (1 << i)){
				g[vp[i].ss].pb(vp[i].ff);
			}else{
				g[vp[i].ff].pb(vp[i].ss);
			}
		}
		f = 0;
		for(int i = 1; i <= n; i++){
			if(vis[i] == 0)
				dfs(i);
		}
		for(int i = 1; i <= n; i++){
			if(!f){
				for(auto to : g[i]){
					ans +=(to < i);
				}
			}
			g[i].clear();
			vis[i] = 0;
		}
	}
	cout << ans;
}
/*
 * Before implementing the problem:
	
	Do I understand the problem correctly?
	Which places are tricky? What do I need to remember to implement them correctly?
	Which place is the heaviest by implementation? Can I do it simpler?
	Which place is the slowest? Where do I need to be careful about constant factors and where I can choose slower but simpler implementation?
	----------------------------------
	If not AC:
 
	Did you remember to do everything to handle the tricky places you thought about before?
	Is the solution correct?
	Do I understand the problem correctly?
	----------------------------------
	If you have a test on which the solution gives wrong answer:
 
	Is the solution doing what it was supposed to do?
	Is the problem in the code or in the idea?
*/

Compilation message

amusementpark.cpp:39:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   39 | main(){
      | ^~~~
amusementpark.cpp: In function 'void fp(std::string)':
amusementpark.cpp:15:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 | void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
amusementpark.cpp:15:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 | void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3420 KB Output is correct
2 Correct 1 ms 3164 KB Output is correct
3 Correct 1 ms 3420 KB Output is correct
4 Correct 1 ms 3420 KB Output is correct
5 Correct 1 ms 3420 KB Output is correct
6 Correct 1 ms 3424 KB Output is correct
7 Correct 1 ms 3420 KB Output is correct
8 Correct 1 ms 3420 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3420 KB Output is correct
2 Correct 1 ms 3164 KB Output is correct
3 Correct 1 ms 3420 KB Output is correct
4 Correct 1 ms 3420 KB Output is correct
5 Correct 1 ms 3420 KB Output is correct
6 Correct 1 ms 3424 KB Output is correct
7 Correct 1 ms 3420 KB Output is correct
8 Correct 1 ms 3420 KB Output is correct
9 Correct 1 ms 3164 KB Output is correct
10 Correct 1 ms 3420 KB Output is correct
11 Correct 1 ms 3420 KB Output is correct
12 Correct 1 ms 3420 KB Output is correct
13 Correct 1 ms 3420 KB Output is correct
14 Correct 1 ms 3420 KB Output is correct
15 Correct 1 ms 3424 KB Output is correct
16 Correct 1 ms 3420 KB Output is correct
17 Correct 1 ms 3420 KB Output is correct
18 Correct 1 ms 3420 KB Output is correct
19 Correct 1 ms 3420 KB Output is correct
20 Correct 1 ms 3416 KB Output is correct
21 Correct 1 ms 3420 KB Output is correct
22 Correct 1 ms 3420 KB Output is correct
23 Correct 2 ms 3416 KB Output is correct
24 Correct 6 ms 3416 KB Output is correct

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3420 KB Output is correct
2 Correct 1 ms 3164 KB Output is correct
3 Correct 1 ms 3420 KB Output is correct
4 Correct 1 ms 3420 KB Output is correct
5 Correct 1 ms 3420 KB Output is correct
6 Correct 1 ms 3424 KB Output is correct
7 Correct 1 ms 3420 KB Output is correct
8 Correct 1 ms 3420 KB Output is correct
9 Correct 1 ms 3164 KB Output is correct
10 Correct 1 ms 3420 KB Output is correct
11 Correct 1 ms 3420 KB Output is correct
12 Correct 1 ms 3420 KB Output is correct
13 Correct 1 ms 3420 KB Output is correct
14 Correct 1 ms 3420 KB Output is correct
15 Correct 1 ms 3424 KB Output is correct
16 Correct 1 ms 3420 KB Output is correct
17 Correct 1 ms 3420 KB Output is correct
18 Correct 1 ms 3420 KB Output is correct
19 Correct 1 ms 3420 KB Output is correct
20 Correct 1 ms 3416 KB Output is correct
21 Correct 1 ms 3420 KB Output is correct
22 Correct 1 ms 3420 KB Output is correct
23 Correct 2 ms 3416 KB Output is correct
24 Correct 6 ms 3416 KB Output is correct
25 Correct 1 ms 3420 KB Output is correct
26 Correct 2 ms 3672 KB Output is correct
27 Correct 1 ms 3420 KB Output is correct
28 Correct 2 ms 3420 KB Output is correct
29 Correct 7 ms 3420 KB Output is correct
30 Correct 40 ms 3420 KB Output is correct
31 Correct 341 ms 3420 KB Output is correct
32 Correct 1 ms 3420 KB Output is correct
33 Correct 1 ms 3416 KB Output is correct
34 Correct 2 ms 3416 KB Output is correct
35 Correct 14 ms 3164 KB Output is correct
36 Correct 210 ms 3420 KB Output is correct
37 Correct 2925 ms 3416 KB Output is correct
38 Execution timed out 3064 ms 3420 KB Time limit exceeded
39 Halted 0 ms 0 KB -

Subtask #4
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3420 KB Output is correct
2 Correct 1 ms 3164 KB Output is correct
3 Correct 1 ms 3420 KB Output is correct
4 Correct 1 ms 3420 KB Output is correct
5 Correct 1 ms 3420 KB Output is correct
6 Correct 1 ms 3424 KB Output is correct
7 Correct 1 ms 3420 KB Output is correct
8 Correct 1 ms 3420 KB Output is correct
9 Correct 1 ms 3164 KB Output is correct
10 Correct 1 ms 3420 KB Output is correct
11 Correct 1 ms 3420 KB Output is correct
12 Correct 1 ms 3420 KB Output is correct
13 Correct 1 ms 3420 KB Output is correct
14 Correct 1 ms 3420 KB Output is correct
15 Correct 1 ms 3424 KB Output is correct
16 Correct 1 ms 3420 KB Output is correct
17 Correct 1 ms 3420 KB Output is correct
18 Correct 1 ms 3420 KB Output is correct
19 Correct 1 ms 3420 KB Output is correct
20 Correct 1 ms 3416 KB Output is correct
21 Correct 1 ms 3420 KB Output is correct
22 Correct 1 ms 3420 KB Output is correct
23 Correct 2 ms 3416 KB Output is correct
24 Correct 6 ms 3416 KB Output is correct
25 Correct 1 ms 3420 KB Output is correct
26 Correct 2 ms 3672 KB Output is correct
27 Correct 1 ms 3420 KB Output is correct
28 Correct 2 ms 3420 KB Output is correct
29 Correct 7 ms 3420 KB Output is correct
30 Correct 40 ms 3420 KB Output is correct
31 Correct 341 ms 3420 KB Output is correct
32 Correct 1 ms 3420 KB Output is correct
33 Correct 1 ms 3416 KB Output is correct
34 Correct 2 ms 3416 KB Output is correct
35 Correct 14 ms 3164 KB Output is correct
36 Correct 210 ms 3420 KB Output is correct
37 Correct 2925 ms 3416 KB Output is correct
38 Execution timed out 3064 ms 3420 KB Time limit exceeded
39 Halted 0 ms 0 KB -

Subtask #5
0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3420 KB Output is correct
2 Correct 1 ms 3164 KB Output is correct
3 Correct 1 ms 3420 KB Output is correct
4 Correct 1 ms 3420 KB Output is correct
5 Correct 1 ms 3420 KB Output is correct
6 Correct 1 ms 3424 KB Output is correct
7 Correct 1 ms 3420 KB Output is correct
8 Correct 1 ms 3420 KB Output is correct
9 Correct 1 ms 3164 KB Output is correct
10 Correct 1 ms 3420 KB Output is correct
11 Correct 1 ms 3420 KB Output is correct
12 Correct 1 ms 3420 KB Output is correct
13 Correct 1 ms 3420 KB Output is correct
14 Correct 1 ms 3420 KB Output is correct
15 Correct 1 ms 3424 KB Output is correct
16 Correct 1 ms 3420 KB Output is correct
17 Correct 1 ms 3420 KB Output is correct
18 Correct 1 ms 3420 KB Output is correct
19 Correct 1 ms 3420 KB Output is correct
20 Correct 1 ms 3416 KB Output is correct
21 Correct 1 ms 3420 KB Output is correct
22 Correct 1 ms 3420 KB Output is correct
23 Correct 2 ms 3416 KB Output is correct
24 Correct 6 ms 3416 KB Output is correct
25 Correct 1 ms 3420 KB Output is correct
26 Correct 2 ms 3672 KB Output is correct
27 Correct 1 ms 3420 KB Output is correct
28 Correct 2 ms 3420 KB Output is correct
29 Correct 7 ms 3420 KB Output is correct
30 Correct 40 ms 3420 KB Output is correct
31 Correct 341 ms 3420 KB Output is correct
32 Correct 1 ms 3420 KB Output is correct
33 Correct 1 ms 3416 KB Output is correct
34 Correct 2 ms 3416 KB Output is correct
35 Correct 14 ms 3164 KB Output is correct
36 Correct 210 ms 3420 KB Output is correct
37 Correct 2925 ms 3416 KB Output is correct
38 Execution timed out 3064 ms 3420 KB Time limit exceeded
39 Halted 0 ms 0 KB -