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답안 #474185

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
474185 2021-09-17T08:28:09 Z NhatMinh0208 Mergers (JOI19_mergers) C++14
0 / 100
 95 ms 36508 KB 
#ifndef CPL_TEMPLATE
#define CPL_TEMPLATE
/*
	Normie's Template v2.5
	Changes:
    Added warning against using pragmas on USACO.
*/
// Standard library in one include.
#include <bits/stdc++.h>
using namespace std;
 
// ordered_set library.
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set(el) tree<el,null_type,less<el>,rb_tree_tag,tree_order_statistics_node_update>
 
// AtCoder library. (Comment out these two lines if you're not submitting in AtCoder.) (Or if you want to use it in other judges, run expander.py first.)
//#include <atcoder/all>
//using namespace atcoder;

//Pragmas (Comment out these three lines if you're submitting in szkopul or USACO.)
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast,unroll-loops,tree-vectorize")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
 
//File I/O.
#define FILE_IN "cseq.inp"
#define FILE_OUT "cseq.out"
#define ofile freopen(FILE_IN,"r",stdin);freopen(FILE_OUT,"w",stdout)
 
//Fast I/O.
#define fio ios::sync_with_stdio(0);cin.tie(0)
#define nfio cin.tie(0)
#define endl "\n"
 
//Order checking.
#define ord(a,b,c) ((a>=b)and(b>=c))
 
//min/max redefines, so i dont have to resolve annoying compile errors.
#define min(a,b) (((a)<(b))?(a):(b))
#define max(a,b) (((a)>(b))?(a):(b))

// Fast min/max assigns to use with AVX.
// Requires g++ 9.2.0.
template<typename T>
__attribute__((always_inline)) void chkmin(T& a, const T& b) {
    a=(a<b)?a:b;
}

template<typename T>
__attribute__((always_inline)) void chkmax(T& a, const T& b) {
    a=(a>b)?a:b;
}
 
//Constants.
#define MOD (ll(998244353))
#define MAX 300001
#define mag 320
const long double PI=3.14159265358979;
 
//Pairs and 3-pairs.
#define p1 first
#define p2 second.first
#define p3 second.second
#define fi first
#define se second
#define pii(element_type) pair<element_type,element_type>
#define piii(element_type) pair<element_type,pii(element_type)>
 
//Quick power of 2.
#define pow2(x) (ll(1)<<x)
 
//Short for-loops.
#define ff(i,__,___) for(int i=__;i<=___;i++)
#define rr(i,__,___) for(int i=__;i>=___;i--)
 
//Typedefs.
#define bi BigInt
typedef long long ll;
typedef long double ld;
typedef short sh;

// Binpow and stuff
ll BOW(ll a, ll x, ll p)
{
	if (!x) return 1;
	ll res=BOW(a,x/2,p);
	res*=res;
	res%=p;
	if (x%2) res*=a;
	return res%p;
}
ll INV(ll a, ll p)
{
	return BOW(a,p-2,p);
}
//---------END-------//
#endif
vector<pii(int)> gt[500001];
vector<int> buc[500001];
ll n,m,i,j,k,t,t1,u,v,a,b;
int col[500001];
int par[500001];
ll hah[500001];
ll dp[500001];
int eu[500001];
int ev[500001];
int gp[500001];
ll rand60() {
    ll a = (rand()&((1<<30)-1));
    ll b = (rand()&((1<<30)-1))<<10;
    ll c = (rand()&((1<<30)-1))<<20;
    ll d = (rand()&((1<<30)-1))<<30;

    return a^b^c^d;
}
void dfs(int x, int p) {
    dp[x]=hah[x];
    for (auto g : gt[x]) if (g.fi-p) {
        dfs(g.fi,x);
        dp[x]^=dp[g.fi];
    }
    if (dp[x]==0) {
        for (auto g : gt[x]) if (g.fi == p) {
            gp[g.se]=1;
        }
    }
}
void dfs2(int x, int p) {
    col[x]=t;
    for (auto g : gt[x]) if (g.fi-p) dfs2(g.fi,x);
}
int dp2[500001][2];
void dfs3(int x, int p) {
    int u=0,a=0;
    dp2[x][0]=dp2[x][1]=1e9;
    for (auto g : gt[x]) if (g.fi-p) {
        a++;
        dfs3(g.fi,x);
        u+=min(dp2[g.fi][0]+1,dp2[g.fi][1]);
    }
    if (a==0) {
        dp2[x][0]=0;
        dp2[x][1]=1e9;
    } else if (a%2) {
        dp2[x][0]=u-a/2;
        dp2[x][1]=u-a/2;
    } else {
        dp2[x][0]=u-a/2;
        dp2[x][1]=u-(a/2-1);
    }

}
int main()
{
    srand(234123);
	fio;
    cin>>n>>m;
    for (i=1;i<n;i++) {
        cin>>eu[i]>>ev[i];
        gt[eu[i]].push_back({ev[i],i});
        gt[ev[i]].push_back({eu[i],i});
    }
    for (i=1;i<=n;i++) {cin>>col[i]; buc[col[i]].push_back(i);}
    for (i=1;i<=m;i++) {
        u=0;
        for (j=0;j<buc[i].size()-1;j++) {
            hah[buc[i][j]]=rand();
            u^=hah[buc[i][j]];
        }
        hah[buc[i][buc[i].size()-1]]=u;
    }
    dfs(1,-1);
    for (i=1;i<=n;i++) {
        col[i]=0;
        gt[i].clear();
    }
    for (i=1;i<n;i++) if (!gp[i]) {
        gt[eu[i]].push_back({ev[i],i});
        gt[ev[i]].push_back({eu[i],i});
    }
    t=0;
    for (i=1;i<=n;i++) if (!col[i]) {
        t++;
        dfs2(i,-1);
    }
    for (i=1;i<=n;i++) gt[i].clear();
    for (i=1;i<n;i++) if (gp[i]) {
        // cout<<col[eu[i]]<<' '<<col[ev[i]]<<endl;
        gt[col[eu[i]]].push_back({col[ev[i]],i});
        gt[col[ev[i]]].push_back({col[eu[i]],i});
    }
    dfs3(1,-1);
    cout<<min(dp2[1][0],dp2[1][1]);
}
// N;

Compilation message

mergers.cpp:23: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
   23 | #pragma comment(linker, "/stack:200000000")
      | 
mergers.cpp: In function 'int main()':
mergers.cpp:168:19: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  168 |         for (j=0;j<buc[i].size()-1;j++) {
      |                  ~^~~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 23792 KB Output is correct
2 Correct 13 ms 23756 KB Output is correct
3 Correct 14 ms 23756 KB Output is correct
4 Correct 13 ms 23752 KB Output is correct
5 Correct 13 ms 23756 KB Output is correct
6 Correct 14 ms 23844 KB Output is correct
7 Correct 14 ms 23808 KB Output is correct
8 Correct 14 ms 23808 KB Output is correct
9 Correct 13 ms 23840 KB Output is correct
10 Correct 15 ms 23756 KB Output is correct
11 Correct 14 ms 23756 KB Output is correct
12 Incorrect 13 ms 23756 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #2
0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 23792 KB Output is correct
2 Correct 13 ms 23756 KB Output is correct
3 Correct 14 ms 23756 KB Output is correct
4 Correct 13 ms 23752 KB Output is correct
5 Correct 13 ms 23756 KB Output is correct
6 Correct 14 ms 23844 KB Output is correct
7 Correct 14 ms 23808 KB Output is correct
8 Correct 14 ms 23808 KB Output is correct
9 Correct 13 ms 23840 KB Output is correct
10 Correct 15 ms 23756 KB Output is correct
11 Correct 14 ms 23756 KB Output is correct
12 Incorrect 13 ms 23756 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #3
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 23792 KB Output is correct
2 Correct 13 ms 23756 KB Output is correct
3 Correct 14 ms 23756 KB Output is correct
4 Correct 13 ms 23752 KB Output is correct
5 Correct 13 ms 23756 KB Output is correct
6 Correct 14 ms 23844 KB Output is correct
7 Correct 14 ms 23808 KB Output is correct
8 Correct 14 ms 23808 KB Output is correct
9 Correct 13 ms 23840 KB Output is correct
10 Correct 15 ms 23756 KB Output is correct
11 Correct 14 ms 23756 KB Output is correct
12 Incorrect 13 ms 23756 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #4
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 68 ms 32416 KB Output is correct
2 Correct 95 ms 36508 KB Output is correct
3 Incorrect 16 ms 24068 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 23792 KB Output is correct
2 Correct 13 ms 23756 KB Output is correct
3 Correct 14 ms 23756 KB Output is correct
4 Correct 13 ms 23752 KB Output is correct
5 Correct 13 ms 23756 KB Output is correct
6 Correct 14 ms 23844 KB Output is correct
7 Correct 14 ms 23808 KB Output is correct
8 Correct 14 ms 23808 KB Output is correct
9 Correct 13 ms 23840 KB Output is correct
10 Correct 15 ms 23756 KB Output is correct
11 Correct 14 ms 23756 KB Output is correct
12 Incorrect 13 ms 23756 KB Output isn't correct
13 Halted 0 ms 0 KB -