Submission #240102

#	Time	Username	Problem	Language	Result	Execution time	Memory
240102		b00n0rp	Mergers (JOI19_mergers)	C++17	0 / 100	145 ms	53740 KiB

mergers

// --------------------------------------------------<TEMPLATE>--------------------------------------------------
// --------------------<optimizations>--------------------
#pragma GCC optimize("O3")
//(UNCOMMENT WHEN HAVING LOTS OF RECURSIONS)\
#pragma comment(linker, "/stack:200000000")
//(UNCOMMENT WHEN NEEDED)\
#pragma GCC optimize("Ofast,unroll-loops,no-stack-protector,fast-math")\
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

// -------------------</optimizations>--------------------

// ---------------<Headers and namespaces>----------------
#include <algorithm>
#include <bitset>
#include <cassert>
#include <chrono>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <limits>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <ratio>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
using namespace std;
/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
using namespace __gnu_pbds;
using namespace __gnu_cxx;
*/
// ---------------</Headers and namespaces>---------------

// -----------------<Defines and typedefs>----------------
// typedef tree<int,null_type,less<int>,rb_tree_tag, \
tree_order_statistics_node_update> indexed_set; // use less_equal for multiset
// order_of_key (val): returns the no. of values less than val
// find_by_order (k): returns the iterator to kth largest element.(0-based)

typedef long double LD;
typedef long long ll;
#define int ll
#define pb push_back
#define mp make_pair
#define REP(i,n) for (int i = 0; i < n; i++)
#define FOR(i,a,b) for (int i = a; i < b; i++)
#define REPD(i,n) for (int i = n-1; i >= 0; i--)
#define FORD(i,a,b) for (int i = a; i >= b; i--)
#define remax(a,b) a = max(a,b)
#define remin(a,b) a = min(a,b)
#define all(v) v.begin(),v.end()
typedef map<int, int> mii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;
#define F first
#define S second
#define PQ(type) priority_queue<type>
#define PQD(type) priority_queue<type,vector<type>,greater<type> >
#define ITR :: iterator it
#define WL(t) while(t --)
#define SZ(x) ((int)(x).size())
#define runtime() ((double)clock() / CLOCKS_PER_SEC)
#define TR(container,it) for(typeof(container.begin()) it=container.begin();it!=container.end();it++)
#define sqr(x) ((x)*(x))
#define inrange(i,a,b) ((i>=min(a,b)) && (i<=max(a,b)))

// -----<SCANF>-----
#define sfi(x) scanf("%d",&x);
#define sfi2(x,y) scanf("%d%d",&x,&y);
#define sfi3(x,y,z) scanf("%d%d%d",&x,&y,&z);

#define sfl(x) scanf("%lld",&x);
#define sfl2(x,y) scanf("%lld%lld",&x,&y);
#define sfl3(x,y,z) scanf("%lld%lld%lld",&x,&y,&z);
#define sfl4(x,y,z,x1) scanf("%lld%lld%lld%lld",&x,&y,&z,&x1);
#define sfl5(x,y,z,x1,y1) scanf("%lld%lld%lld%lld%lld",&x,&y,&z,&x1,&y1);
#define sfl6(x,y,z,x1,y1,z1) scanf("%lld%lld%lld%lld%lld%lld",&x,&y,&z,&x1,&y1,&z1);

#define sfs(x) scanf("%s",x);
#define sfs2(x,y) scanf("%s%s",x,y);
#define sfs3(x,y,z) scanf("%s%s%s",x,y,z);
// ----</SCANF>-----

// ----<PRINTF>-----
#define pfi(x) printf("%d\n",x);
#define pfi2(x,y) printf("%d %d\n",x,y);
#define pfi3(x,y,z) printf("%d %d %d\n",x,y,z);

#define pfl(x) printf("%lld\n",x);
#define pfl2(x,y) printf("%lld %lld\n",x,y);
#define pfl3(x,y,z) printf("%lld %lld %lld\n",x,y,z);

#define pfs(x) printf("%s\n",x);
#define pfs2(x,y) printf("%s %s\n",x,y);
#define pfs3(x,y,z) printf("%s %s %s\n",x,y,z);

#define pwe(x) printf("%lld ",x); // print without end
// ----</PRINTF>----

#define FLSH fflush(stdout)
#define fileIO(name) \
    freopen(name".in", "r", stdin); \
    freopen(name".out", "w", stdout);
#define PRECISION(x) cout << fixed << setprecision(x); 
#define FAST_IO ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

// ----------------</Defines and typedefs>----------------

// -------------------<Debugging stuff>-------------------
#define TRACE

#ifdef TRACE
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
template <typename Arg1>
void __f(const char* name, Arg1&& arg1) {
	cerr << name << " : " << arg1 << std::endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args) {
	const char* comma = strchr(names + 1, ','); cerr.write(names, comma - names) << " : " << arg1 << " | "; __f(comma + 1, args...);
}
#else
#define trace(...)
#endif

// ------------------</Debugging stuff>-------------------

// ------------------------<Consts>-----------------------
const int MAXN = 1000005;
const int SQRTN = 1003;
const int LOGN = 22;
const double PI = acos(-1);

#ifdef int
const int INF = 1e16;
#else
const int INF = 1e9;
#endif

const int MOD = 1000000007;
const int FMOD = 998244353;
const double eps = 1e-9;

// -----------------------</Consts>-----------------------

// -------------------------<RNG>-------------------------
mt19937 RNG(chrono::steady_clock::now().time_since_epoch().count());
#define SHUF(v) shuffle(all(v), RNG);
// Use mt19937_64 for 64 bit random numbers.

// ------------------------</RNG>-------------------------
// ----------------------<MATH>---------------------------
template<typename T> T gcd(T a, T b) { return(b ? __gcd(a, b) : a); }
template<typename T> T lcm(T a, T b) { return(a * (b / gcd(a, b))); }
int add(int a, int b, int c = MOD) { int res = a + b; return(res >= c ? res - c : res); }
int mod_neg(int a, int b, int c = MOD) { int res; if (abs(a - b) < c)res = a - b; else res = (a - b) % c; return(res < 0 ? res + c : res); }
int mul(int a, int b, int c = MOD) { ll res = (ll)a * b; return(res >= c ? res % c : res); }
int muln(int a, int b, int c = MOD) { ll res = (ll)a * b; return ((res % c) + c) % c; }
ll mulmod(ll a, ll b, ll m = MOD) { ll q = (ll)(((LD)a * (LD)b) / (LD)m); ll r = a * b - q * m; if (r > m)r %= m; if (r < 0)r += m; return r; }
template<typename T>T expo(T e, T n) { T x = 1, p = e; while (n) { if (n & 1)x = x * p; p = p * p; n >>= 1; }return x; }
template<typename T>T power(T e, T n, T m = MOD) { T x = 1, p = e; while (n) { if (n & 1)x = mul(x, p, m); p = mul(p, p, m); n >>= 1; }return x; }
template<typename T>T extended_euclid(T a, T b, T& x, T& y) {
	T xx = 0, yy = 1; y = 0; x = 1; while (b) {
		T q = a / b, t = b; b = a % b; a = t; \
			t = xx; xx = x - q * xx; x = t; t = yy; yy = y - q * yy; y = t;
	}return a;
}
template<typename T>T mod_inverse(T a, T n = MOD) { T x, y, z = 0; T d = extended_euclid(a, n, x, y); return(d > 1 ? -1 : mod_neg(x, z, n)); }
const int FACSZ = 1; // Make sure to change this
int fact[FACSZ], ifact[FACSZ];
void precom(int c = MOD) {
	fact[0] = 1;
	FOR(i, 1, FACSZ) fact[i] = mul(fact[i - 1], i, c);
	ifact[FACSZ - 1] = mod_inverse(fact[FACSZ - 1], c);
	REPD(i, FACSZ - 1) {
		ifact[i] = mul(i + 1, ifact[i + 1], c);
	}
}
int ncr(int n, int r, int c = MOD) {
	return mul(mul(ifact[r], ifact[n - r], c), fact[n], c);
}
// ----------------------</MATH>--------------------------
// --------------------------------------------------</TEMPLATE>--------------------------------------------------

void solvethetestcase();

signed main() {
	// (UNCOMMENT FOR CIN/COUT) \
	FAST_IO
	PRECISION(10)

	int t = 1;
	// (UNCOMMENT FOR MULTIPLE TEST CASES) \
	sfl(t);
	FOR(testcase, 1, t + 1) {
		// (UNCOMMENT FOR CODEJAM) \
		printf("Case #%lld: ",testcase); 
		solvethetestcase();
	}
}

int n,k;	
vi adj[500005];
int state[500005];
vi gg[500005];
int mind[500005],dep[500005],par[500005][21];
bitset<500005> bad;
int bcnt[500005];

void dfs(int u,int p,int d = 0){
	dep[u] = mind[u] = d;
	par[u][0] = p;
	for(auto v:adj[u]){
		if(v != p) dfs(v,u,d+1);
	}
}

int lca(int u,int v){
	if(dep[v] < dep[u]) swap(u,v);
	FORD(j,20,0){
		if(dep[v]-(1<<j) >= dep[u]){
			v = par[v][j];
		}
	}
	if(u == v) return u;
	FORD(j,20,0){
		if(par[u][j] != par[v][j]){
			u = par[u][j];
			v = par[v][j];
		}
	}
	return par[u][0];
}

void refresh(int u){
	bcnt[u] = 0;
	for(auto v:adj[u]){
		if(v == par[u][0]) continue;
		refresh(v);
		remin(mind[u],mind[v]);
		bcnt[u] += bcnt[v];
	}
	if(mind[u] == dep[u]) bad[u] = 1;
	bcnt[u] += bad[u];
}

pii dp[500005];

void solve(int u){
	int cur1 = 0,cur2 = 0,cur3 = 0;
	for(auto v:adj[u]){
		if(v == par[u][0] or bcnt[v] == 0) continue;
		solve(v);
		cur1++;
		cur2 += dp[v].F;
		cur3 += dp[v].S;
		if(bad[v] == 0 and dp[v].S == 0){
			cur1--;
		}	
	}
	dp[u].S = cur1%2;
	cur1 -= cur3*2;
	remax(cur1,0LL);
	dp[u].F = (cur1+1)/2 + cur2;
	// trace(u,dp[u].F,dp[u].S);
}

void solvethetestcase() {
	sfl2(n,k)
	REP(i,n-1){
		int u,v; sfl2(u,v)
		adj[u].pb(v);
		adj[v].pb(u);
	}
	dfs(1,1);
	FOR(j,1,21){
		FOR(i,1,n+1){
			par[i][j] = par[par[i][j-1]][j-1];
		}
	}
	FOR(i,1,n+1){
		sfl(state[i])
		gg[state[i]].pb(i);
	}
	FOR(i,1,k+1){
		int x = gg[i][0];
		FOR(j,1,gg[i].size()) x = lca(x,gg[i][j]);
		for(auto u:gg[i]){
			remin(mind[u],dep[x]);
		}
	}
	refresh(1);
	if(bcnt[1] == 0){
		printf("0\n");
		return;
	}
	solve(1);
	pfl(dp[1].F)
}

Compilation message (stderr)

mergers.cpp:4:1: warning: multi-line comment [-Wcomment]
 //(UNCOMMENT WHEN HAVING LOTS OF RECURSIONS)\
 ^
mergers.cpp:6:1: warning: multi-line comment [-Wcomment]
 //(UNCOMMENT WHEN NEEDED)\
 ^
mergers.cpp:54:1: warning: multi-line comment [-Wcomment]
 // typedef tree<int,null_type,less<int>,rb_tree_tag, \
 ^
mergers.cpp:209:2: warning: multi-line comment [-Wcomment]
  // (UNCOMMENT FOR CIN/COUT) \
  ^
mergers.cpp:214:2: warning: multi-line comment [-Wcomment]
  // (UNCOMMENT FOR MULTIPLE TEST CASES) \
  ^
mergers.cpp:217:3: warning: multi-line comment [-Wcomment]
   // (UNCOMMENT FOR CODEJAM) \
   ^
mergers.cpp: In function 'void solvethetestcase()':
mergers.cpp:65:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define FOR(i,a,b) for (int i = a; i < b; i++)
mergers.cpp:308:7:
   FOR(j,1,gg[i].size()) x = lca(x,gg[i][j]);
       ~~~~~~~~~~~~~~~~                
mergers.cpp:308:3: note: in expansion of macro 'FOR'
   FOR(j,1,gg[i].size()) x = lca(x,gg[i][j]);
   ^~~
mergers.cpp:94:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 #define sfl2(x,y) scanf("%lld%lld",&x,&y);
                   ~~~~~^~~~~~~~~~~~~~~~~~
mergers.cpp:290:2: note: in expansion of macro 'sfl2'
  sfl2(n,k)
  ^~~~
mergers.cpp:94:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 #define sfl2(x,y) scanf("%lld%lld",&x,&y);
                   ~~~~~^~~~~~~~~~~~~~~~~~
mergers.cpp:292:12: note: in expansion of macro 'sfl2'
   int u,v; sfl2(u,v)
            ^~~~
mergers.cpp:93:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 #define sfl(x) scanf("%lld",&x);
                ~~~~~^~~~~~~~~~~
mergers.cpp:303:3: note: in expansion of macro 'sfl'
   sfl(state[i])
   ^~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 24
• Subtask 3: 0 / 14
• Subtask 4: 0 / 22
• Subtask 5: 0 / 30