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Submission #635876

# Submission time Handle Problem Language Result Execution time Memory
635876 2022-08-27T09:03:00 Z S2speed Party (INOI20_party) C++17
7 / 100
 3000 ms 356 KB 
#include<bits/stdc++.h>

using namespace std;

#pragma GCC optimize ("Ofast")

#define all(x) x.begin() , x.end()
#define sze(x) (ll)(x.size())
typedef long long ll;

const ll maxn = 206 , md = 1e9 + 7 , inf = 2e16;

inline ll tav(ll n , ll k){
	ll res = 1;
	while(k > 0){
		if(k & 1){
			res *= n; res %= md;
		}
		n *= n; n %= md;
		k >>= 1;
	}
	return res;
}

ll n , ans[maxn];
vector<ll> adj[maxn] , bfs;
ll dis[maxn] , cnt[maxn] , res;

void BFS(ll r){
	memset(dis , 63 , sizeof(dis));
	bfs.clear();
	dis[r] = 0;
	bfs.push_back(r);
	ll x = 0;
	while(x < sze(bfs)){
		ll v = bfs[x++];
		for(auto i : adj[v]){
			if(dis[i] < inf) continue;
			dis[i] = dis[v] + 1;
			bfs.push_back(i);
		}
	}
	return;
}

void sub1(){
	if(ans[n] != -1){
		cout<<ans[n]<<'\n';
		return;
	}
	res = 0;
	for(ll i = 0 ; i < n ; i++) adj[i].clear();
	for(ll i = 1 ; i < n ; i++){
		ll par = (i - 1) >> 1;
		adj[par].push_back(i); adj[i].push_back(par);
	}
	for(ll i = 0 ; i < n ; i++){
		BFS(i);
		memset(cnt , 0 , sizeof(cnt));
		for(ll j = 0 ; j < n ; j++){
			cnt[dis[j]]++;
		}
		ll ps = n;
		for(ll d = 0 ; d < n ; d++){
			if(cnt[d] == 0) break;
			ps -= cnt[d];
			ll h = (tav(2 , cnt[d]) - 1) * tav(2 , ps) % md * d % md;
			res += h;
		}
	}
//	cout<<res<<'\n';
	res %= md;
	res *= tav(tav(2 , n) - 1 , md - 2);
	res %= md;
	ans[n] = res;
	cout<<res<<'\n';
	return;
}

ll tl[120];

void sub2(){
	ll t = -1;
	for(ll i = 0 ; i < 60 ; i++){
		if((1ll << i) == n + 1){
			t = i;
			break;
		}
	}
	if(t == -1) return;
	res = 0;
	for(ll i = 0 , z = 1 ; i < t ; i++ , z <<= 1){
		memset(tl , 0 , sizeof(tl));
		ll v = z , d = i , y = 0 , o = 0;
		if((z << 1) == n + 1){
			y = 1;
			tl[1] = 1;
		}
		tl[t - i - 2] = (1ll << (t - i - 1));
		ll cur = 1 , ps = n;
		for(ll j = 0 ; j < 120 && ps > 0 ; j++){
			ps -= cur;
			ll h = (tav(2 , cur) - 1) * tav(2 , ps) % md * j % md;
			o += h;
			cur -= y;
			y = tl[j];
			cur <<= 1;
			if(v == 1){
				cur--;
				v = 0;
			}
			if(v > 1){
				v >>= 1; d--;
				tl[j + t - d - 1] = (1ll << (t - d - 2));
			}
			cur += (j == 0);
		}
		o %= md;
		o *= z % md; o %= md;
		res += o;
	}
//	cout<<res<<'\n';
	res %= md;
	res *= tav(tav(2 , n) - 1 , md - 2);
	res %= md;
	cout<<res<<'\n';
	return;
}

void solve(){
	cin>>n;
	if(n <= 200){
		sub1();
		return;
	}
	sub2();
	return;
}

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);

	memset(ans , -1 , sizeof(ans));
	ll T;
	cin>>T;
	while(T--) solve();
	return 0;
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 336 KB Output is correct
2 Correct 7 ms 340 KB Output is correct
3 Correct 6 ms 340 KB Output is correct
4 Correct 6 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 328 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 276 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct

Subtask #2
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 111 ms 336 KB Output is correct
2 Correct 126 ms 340 KB Output is correct
3 Correct 110 ms 320 KB Output is correct
4 Correct 102 ms 328 KB Output is correct
5 Correct 125 ms 324 KB Output is correct
6 Correct 116 ms 340 KB Output is correct
7 Correct 98 ms 320 KB Output is correct
8 Correct 112 ms 340 KB Output is correct
9 Correct 114 ms 340 KB Output is correct
10 Correct 115 ms 340 KB Output is correct
11 Execution timed out 3094 ms 356 KB Time limit exceeded
12 Halted 0 ms 0 KB -

Subtask #3
0 / 33.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 336 KB Output is correct
2 Correct 7 ms 340 KB Output is correct
3 Correct 6 ms 340 KB Output is correct
4 Correct 6 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 328 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 276 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 111 ms 336 KB Output is correct
22 Correct 126 ms 340 KB Output is correct
23 Correct 110 ms 320 KB Output is correct
24 Correct 102 ms 328 KB Output is correct
25 Correct 125 ms 324 KB Output is correct
26 Correct 116 ms 340 KB Output is correct
27 Correct 98 ms 320 KB Output is correct
28 Correct 112 ms 340 KB Output is correct
29 Correct 114 ms 340 KB Output is correct
30 Correct 115 ms 340 KB Output is correct
31 Execution timed out 3094 ms 356 KB Time limit exceeded
32 Halted 0 ms 0 KB -