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답안 #328982

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
328982 2020-11-18T16:42:21 Z AmineWeslati 열대 식물원 (Tropical Garden) (IOI11_garden) C++14
100 / 100
 2935 ms 44652 KB 
//Never stop trying
/*#pragma GCC target ("avx2")
#pragma GCC optimize ("Ofast")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")*/
#include "bits/stdc++.h"
#ifndef LOCAL
#include "garden.h"
#include "gardenlib.h"
#endif
using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

typedef long long ll;
typedef string str;
typedef double db;
typedef long double ld;
typedef pair<int, int> pi;
#define fi first
#define se second
typedef vector<int> vi;
typedef vector<pi> vpi;
typedef vector<str> vs;
typedef vector<ld> vd;
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)

const int MOD = 1e9 + 7; //998244353
const ll INF = 1e9;
const int MX = 3e5 + 100;
const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0}; //right left down up

template<class T> using V = vector<T>;
template<class T> bool ckmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }

ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); } // divide a by b rounded up
//constexpr int log2(int x) { return 31 - __builtin_clz(x); } // floor(log2(x))

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());
//mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());

ll random(ll a, ll b){
    return a + rng() % (b - a + 1);
}

#ifndef LOCAL  
#define cerr if(false) cerr
#endif
#define dbg(x) cerr << #x << " : " << x << endl; 
#define dbgs(x,y) cerr << #x << " : " << x << " / " << #y << " : " << y << endl;
#define dbgv(v) cerr << #v << " : " << "[ "; for(auto it : v) cerr << it << ' '; cerr << ']' << endl;
#define here() cerr << "here" << endl;

void IO() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
}



#ifdef LOCAL
void answer(int x){
	cout << x << endl;
}
#endif	

int N,P;
vpi adj0[MX]; //initial graph
vi adj[MX]; //constructed graph

void construct(){
	int fir[N],sec[MX];
	FOR(u,0,N){
		int mx=-INF,nxt=-1;
		for(auto v: adj0[u]) if(ckmax(mx,v.se)) nxt=v.fi;
		fir[u]=nxt;
	}
	FOR(u,0,N){
		int mx=-INF,nxt=-1;
		for(auto v: adj0[u]) if(v.fi!=fir[u] && ckmax(mx,v.se)) nxt=v.fi;
		if(mx==-INF) nxt=fir[u];
		sec[u]=nxt;
	}

	//FOR(i,0,N) cout << fir[i] << ' ' << sec[i] << endl;

	FOR(i,0,N){
		//normal state
		/*if(fir[fir[i]]==i) adj[i*2].pb(fir[i]*2+1);
		else adj[i*2].pb(fir[i]*2);

		if(fir[sec[i]]==i) adj[i*2+1].pb(sec[i]*2+1);
		else adj[i*2+1].pb(sec[i]*2);*/

		//inverted
		if(fir[fir[i]]==i) adj[fir[i]*2+1].pb(i*2);
		else adj[fir[i]*2].pb(i*2);

		if(fir[sec[i]]==i) adj[sec[i]*2+1].pb(i*2+1);
		else adj[sec[i]*2].pb(i*2+1);
	}
	/*FOR(i,0,N*2){
		cerr << i/2; if(i&1) cerr << 'p'; cerr << endl;
		vi v=adj[i];
		FOR(j,0,sz(v)){
			cerr << v[j]/2;
			if(v[j]&1) cerr << 'p';
		}
		cerr << endl << endl;
	}*/
}

int F[MX],Fp[MX];
int C=0,Cp=0;
int vis[MX];

void dfs(int u, int t){
	if(!t && F[u]==INF) F[u]=0;
	if(t && Fp[u]==INF) Fp[u]=0;
	
	vis[u]=1;
	for(auto v: adj[u]){
		if(!vis[v]){
			if(!t) F[v]=F[u]+1;
			else Fp[v]=Fp[u]+1;
			dfs(v,t);
		}
		else if(vis[v]==1 && (v==P*2||v==P*2+1)){
			if(!t) C=F[u]+1;
			else Cp=Fp[u]+1;
		}
	}
	vis[u]=2;
}

void count_routes(int NN, int M, int PP, int R[][2], int Q, int G[]){
	N=NN; P=PP;
	FOR(i,0,M){
		int u=R[i][0],v=R[i][1];
		adj0[u].pb({v,M-i}); adj0[v].pb({u,M-i});
	}

	construct();

	fill(F,F+MX,INF);
	fill(vis,vis+MX,0);
	dfs(P*2,0);

	fill(Fp,Fp+MX,INF);
	fill(vis,vis+MX,0);
	dfs(P*2+1,1);

	/*FOR(i,0,N*2){
		cerr << i/2; if(i&1) cerr << 'p'; cerr << endl;
		cerr << F[i] << endl;
		cerr << endl;
	}*/

	//dbgs(C,Cp);

	FOR(i,0,Q){
		int ans=0,K=G[i];
		FOR(node,0,N){
			bool y=false;
			int u=node*2;

			int x=F[u];
			if(x==K || (x<K && C!=0 && (K-x)%C==0)) y=true;

			x=Fp[u];
			if(x==K || (x<K && Cp!=0 && (K-x)%Cp==0)) y=true;
			
			if(y) ans++;
		}
		answer(ans);
	}
}

#ifdef LOCAL
int main() {
    boost; IO();

    int N,M,P,Q;
    cin>>N>>M>>P;
    int R[M][2]; FOR(i,0,M) cin>>R[i][0]>>R[i][1];
    cin>>Q;
    int G[Q];
   	FOR(i,0,Q) cin>>G[i];
    count_routes(N,M,P,R,Q,G);

    return 0;
}
#endif

/*
6 6 0 1
1 2
0 1
0 3
3 4
4 5
1 5
3
*/

/*
5 5 2 2 
1 0
1 2
3 2
1 3
4 2
0 1
*/

/* Careful!!!
    .Array bounds
    .Infinite loops
    .Uninitialized variables / empty containers
    .Multisets are shit

   Some insights:
    .Binary search
    .Graph representation
    .Write brute force code
    .Change your approach
*/

Subtask #1
49.0 / 49.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 18156 KB Output is correct
2 Correct 11 ms 18028 KB Output is correct
3 Correct 11 ms 18156 KB Output is correct
4 Correct 12 ms 18028 KB Output is correct
5 Correct 11 ms 18028 KB Output is correct
6 Correct 12 ms 18284 KB Output is correct
7 Correct 11 ms 18028 KB Output is correct
8 Correct 11 ms 18028 KB Output is correct
9 Correct 13 ms 18284 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 18156 KB Output is correct
2 Correct 11 ms 18028 KB Output is correct
3 Correct 11 ms 18156 KB Output is correct
4 Correct 12 ms 18028 KB Output is correct
5 Correct 11 ms 18028 KB Output is correct
6 Correct 12 ms 18284 KB Output is correct
7 Correct 11 ms 18028 KB Output is correct
8 Correct 11 ms 18028 KB Output is correct
9 Correct 13 ms 18284 KB Output is correct
10 Correct 11 ms 18028 KB Output is correct
11 Correct 21 ms 20332 KB Output is correct
12 Correct 38 ms 22252 KB Output is correct
13 Correct 62 ms 38252 KB Output is correct
14 Correct 141 ms 31468 KB Output is correct
15 Correct 155 ms 31976 KB Output is correct
16 Correct 113 ms 29056 KB Output is correct
17 Correct 111 ms 28140 KB Output is correct
18 Correct 39 ms 22400 KB Output is correct
19 Correct 124 ms 31468 KB Output is correct
20 Correct 145 ms 31980 KB Output is correct
21 Correct 112 ms 28908 KB Output is correct
22 Correct 119 ms 28140 KB Output is correct
23 Correct 132 ms 32748 KB Output is correct

Subtask #3
31.0 / 31.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 18156 KB Output is correct
2 Correct 11 ms 18028 KB Output is correct
3 Correct 11 ms 18156 KB Output is correct
4 Correct 12 ms 18028 KB Output is correct
5 Correct 11 ms 18028 KB Output is correct
6 Correct 12 ms 18284 KB Output is correct
7 Correct 11 ms 18028 KB Output is correct
8 Correct 11 ms 18028 KB Output is correct
9 Correct 13 ms 18284 KB Output is correct
10 Correct 11 ms 18028 KB Output is correct
11 Correct 21 ms 20332 KB Output is correct
12 Correct 38 ms 22252 KB Output is correct
13 Correct 62 ms 38252 KB Output is correct
14 Correct 141 ms 31468 KB Output is correct
15 Correct 155 ms 31976 KB Output is correct
16 Correct 113 ms 29056 KB Output is correct
17 Correct 111 ms 28140 KB Output is correct
18 Correct 39 ms 22400 KB Output is correct
19 Correct 124 ms 31468 KB Output is correct
20 Correct 145 ms 31980 KB Output is correct
21 Correct 112 ms 28908 KB Output is correct
22 Correct 119 ms 28140 KB Output is correct
23 Correct 132 ms 32748 KB Output is correct
24 Correct 12 ms 18028 KB Output is correct
25 Correct 157 ms 20348 KB Output is correct
26 Correct 235 ms 22376 KB Output is correct
27 Correct 2557 ms 38368 KB Output is correct
28 Correct 1381 ms 31780 KB Output is correct
29 Correct 2927 ms 31852 KB Output is correct
30 Correct 1658 ms 29316 KB Output is correct
31 Correct 1644 ms 28268 KB Output is correct
32 Correct 245 ms 22380 KB Output is correct
33 Correct 1379 ms 31724 KB Output is correct
34 Correct 2935 ms 32100 KB Output is correct
35 Correct 1754 ms 29008 KB Output is correct
36 Correct 1702 ms 28140 KB Output is correct
37 Correct 1173 ms 32880 KB Output is correct
38 Correct 2257 ms 44652 KB Output is correct