Submission #328638

#	Time	Username	Problem	Language	Result	Execution time	Memory
328638		AmineWeslati	Tropical Garden (IOI11_garden)	C++14	0 / 100	5 ms	5100 KiB

garden

//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 = 1e18;
const int MX = 2e5 + 10;
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
}

int N,P;
vpi adj[MX];

int ans=0;
void dfs(int u, int prev, int cur, int d){
	if(cur==d){
		if(u==P){
			ans++;
		}
		return;
	}
	int nxt=-1,mx=-1;
	for(auto v: adj[u]) if(v.fi!=prev && ckmax(mx,v.se)) nxt=v.se;
	if(nxt==-1) nxt=prev;
	dfs(nxt,u,cur+1,d); 
}

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

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];
		adj[u].pb({v,i}); adj[v].pb({u,i});
	}
	int d=G[0];
	FOR(i,0,N){
		for(auto v: adj[i]) dfs(v.fi,i,1,d);
	}
	answer(ans);
}

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

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

    return 0;
}
#endif

/* 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: 0 / 49
• Subtask 2: 0 / 20
• Subtask 3: 0 / 31