Submission #65538

#	Time	Username	Problem	Language	Result	Execution time	Memory
65538		Benq	Cats or Dogs (JOI18_catdog)	C++11	38 / 100	3041 ms	7776 KiB

catdog

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;
 
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;

typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<cd> vcd;

template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define FOR(i, a, b) for (int i=a; i<(b); i++)
#define F0R(i, a) for (int i=0; i<(a); i++)
#define FORd(i,a,b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i,a) for (int i = (a)-1; i >= 0; i--)

#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()

const int MOD = 1000000007;
const ll INF = 1e18;
const int MX = 100001;

// #define LOCAL 

#ifdef LOCAL 
#else
    #include "catdog.h"
#endif

int N, st[MX];
vi adj[MX];

pi get(int x, int p) {
    pi bes = {0,0};
    for (int i: adj[x]) if (i != p) {
        pi t = get(i,x);
        bes.f += t.f, bes.s += t.s;
    }
    if (st[x] == 1) bes.s = bes.f+1;
    else if (st[x] == 2) bes.f = bes.s+1;
    else {
        bes.f = min(bes.f,bes.s+1);
        bes.s = min(bes.s,bes.f+1);
    }
    return bes;
}

int query() { 
    pi x = get(1,0); 
    return min(x.f,x.s);
}

void initialize(int n, std::vector<int> A, std::vector<int> B) {
    N = n;
    F0R(i,N-1) adj[A[i]].pb(B[i]), adj[B[i]].pb(A[i]);
}

int cat(int v) {
    st[v] = 1;
    return query();
}

int dog(int v) {
    st[v] = 2;
    return query();
}

int neighbor(int v) {
    st[v] = 0;
    return query();
}

#ifdef LOCAL 
int readInt(){
	int i;
	if(scanf("%d",&i)!=1){
		fprintf(stderr,"Error while reading input\n");
		exit(1);
	}
	return i;
}

int main(){
	int N=readInt();
	
	std::vector<int> A(N-1),B(N-1);
	for(int i=0;i<N-1;i++)
	{
		A[i]=readInt();
		B[i]=readInt();
	}
	int Q;
	assert(scanf("%d",&Q)==1);
	std::vector <int> T(Q),V(Q);
	for(int i=0;i<Q;i++)
	{
		T[i]=readInt();
		V[i]=readInt();
	}
	
	initialize(N,A,B);
	
	std::vector<int> res(Q);
	for(int j=0;j<Q;j++)
	{
		if(T[j]==1) res[j]=cat(V[j]);
		else if(T[j]==2) res[j]=dog(V[j]);
		else res[j]=neighbor(V[j]);
	}
	for(int j=0;j<Q;j++)
		printf("%d\n",res[j]);
	return 0;
}
#endif

/* Look for:
* the exact constraints (multiple sets are too slow for n=10^6 :( ) 
* special cases (n=1?)
* overflow (ll vs int?)
* array bounds
*/

• Subtask 1: 8 / 8
• Subtask 2: 30 / 30
• Subtask 3: 0 / 62