Submission #134475

#	Time	Username	Problem	Language	Result	Execution time	Memory
134475		Benq	Space Pirate (JOI14_space_pirate)	C++14	80 / 100	2041 ms	23412 KiB

space_pirate

#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")

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

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
 
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 trav(a, x) for (auto& a : x)

#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound

#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rsz resize

const int MOD = 1000000007; // 998244353
const ll INF = 1e18;
const int MX = 100005;
const ld PI = 4*atan((ld)1);

template<class T> void ckmin(T &a, T b) { a = min(a, b); }
template<class T> void ckmax(T &a, T b) { a = max(a, b); }

namespace input {
    template<class T> void re(complex<T>& x);
    template<class T1, class T2> void re(pair<T1,T2>& p);
    template<class T> void re(vector<T>& a);
    template<class T, size_t SZ> void re(array<T,SZ>& a);

    template<class T> void re(T& x) { cin >> x; }
    void re(double& x) { string t; re(t); x = stod(t); }
    void re(ld& x) { string t; re(t); x = stold(t); }
    template<class Arg, class... Args> void re(Arg& first, Args&... rest) { 
        re(first); re(rest...); 
    }

    template<class T> void re(complex<T>& x) { T a,b; re(a,b); x = cd(a,b); }
    template<class T1, class T2> void re(pair<T1,T2>& p) { re(p.f,p.s); }
    template<class T> void re(vector<T>& a) { F0R(i,sz(a)) re(a[i]); }
    template<class T, size_t SZ> void re(array<T,SZ>& a) { F0R(i,SZ) re(a[i]); }
}

using namespace input;

namespace output {
    template<class T1, class T2> void pr(const pair<T1,T2>& x);
    template<class T, size_t SZ> void pr(const array<T,SZ>& x);
    template<class T> void pr(const vector<T>& x);
    template<class T> void pr(const set<T>& x);
    template<class T1, class T2> void pr(const map<T1,T2>& x);

    template<class T> void pr(const T& x) { cout << x; }
    template<class Arg, class... Args> void pr(const Arg& first, const Args&... rest) { 
        pr(first); pr(rest...); 
    }

    template<class T1, class T2> void pr(const pair<T1,T2>& x) { 
        pr("{",x.f,", ",x.s,"}"); 
    }
    template<class T> void prContain(const T& x) {
        pr("{");
        bool fst = 1; for (const auto& a: x) pr(!fst?", ":"",a), fst = 0; // const needed for vector<bool>
        pr("}");
    }
    template<class T, size_t SZ> void pr(const array<T,SZ>& x) { prContain(x); }
    template<class T> void pr(const vector<T>& x) { prContain(x); }
    template<class T> void pr(const set<T>& x) { prContain(x); }
    template<class T1, class T2> void pr(const map<T1,T2>& x) { prContain(x); }
    
    void ps() { pr("\n"); }
    template<class Arg> void ps(const Arg& first) { 
        pr(first); ps(); // no space at end of line
    }
    template<class Arg, class... Args> void ps(const Arg& first, const Args&... rest) { 
        pr(first," "); ps(rest...); // print w/ spaces
    }
}

using namespace output;

namespace io {
    void setIn(string s) { freopen(s.c_str(),"r",stdin); }
    void setOut(string s) { freopen(s.c_str(),"w",stdout); }
    void setIO(string s = "") {
        ios_base::sync_with_stdio(0); cin.tie(0); // fast I/O
        if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
    }
}

using namespace io;

template<class T> T invGeneral(T a, T b) {
    a %= b; if (a == 0) return b == 1 ? 0 : -1;
    T x = invGeneral(b,a); 
    return x == -1 ? -1 : ((1-(ll)b*x)/a+b)%b;
}

template<class T> struct modular {
    T val; 
    explicit operator T() const { return val; }
    modular() { val = 0; }
    modular(const ll& v) { 
        val = (-MOD <= v && v <= MOD) ? v : v % MOD;
        if (val < 0) val += MOD;
    }
    
    friend ostream& operator<<(ostream& os, const modular& a) { return os << a.val; }
    friend bool operator==(const modular& a, const modular& b) { return a.val == b.val; }
    friend bool operator!=(const modular& a, const modular& b) { return !(a == b); }
    friend bool operator<(const modular& a, const modular& b) { return a.val < b.val; }

    modular operator-() const { return modular(-val); }
    modular& operator+=(const modular& m) { if ((val += m.val) >= MOD) val -= MOD; return *this; }
    modular& operator-=(const modular& m) { if ((val -= m.val) < 0) val += MOD; return *this; }
    modular& operator*=(const modular& m) { val = (ll)val*m.val%MOD; return *this; }
    friend modular pow(modular a, ll p) {
        modular ans = 1; for (; p; p /= 2, a *= a) if (p&1) ans *= a;
        return ans;
    }
    friend modular inv(const modular& a) { 
        auto i = invGeneral(a.val,MOD); assert(i != -1);
        return i;
    } // equivalent to return exp(b,MOD-2) if MOD is prime
    modular& operator/=(const modular& m) { return (*this) *= inv(m); }
    
    friend modular operator+(modular a, const modular& b) { return a += b; }
    friend modular operator-(modular a, const modular& b) { return a -= b; }
    friend modular operator*(modular a, const modular& b) { return a *= b; }
    
    friend modular operator/(modular a, const modular& b) { return a /= b; }
};

typedef modular<int> mi;
typedef pair<mi,mi> pmi;
typedef vector<mi> vmi;
typedef vector<pmi> vpmi;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int N,A[MX]; // ind[MX],ori;
ll K, ans[MX];

vector<vi> cyc;
array<int,3> CYC[MX];
int vis[MX];
vi path;

int par(int a, ll b) {
	assert(b >= CYC[a][2]);
	b -= CYC[a][2];
	int ind = (CYC[a][1]+b)%sz(cyc[CYC[a][0]]);
	return cyc[CYC[a][0]][ind];
}

void dfs(int a, int b) {
	if (vis[a]) {
		if (vis[a] != b) return;
		array<int,3> lst = {sz(cyc),0,0}; cyc.pb({});
		while (CYC[a][0] == -1) {
			CYC[a] = lst; cyc.back().pb(a);
			lst[1] ++; a = A[a];
		}
		return;
	}
	vis[a] = b; dfs(A[a],b);
	if (CYC[a][0] == -1) CYC[a] = {CYC[A[a]][0],CYC[A[a]][1],CYC[A[a]][2]+1};
}

vi adj[MX];
int dist[MX];
int special;

void init() {
    setIO(); re(N,K); 
    FOR(i,1,N+1) {
    	re(A[i]);
    	adj[A[i]].pb(i);
    	CYC[i] = {-1,-1,-1}; // cycle, position, dist
    }
    FOR(i,1,N+1) if (!vis[i]) dfs(i,i);
    FOR(i,1,N+1) dist[i] = -1;
    
    int cur = 1, lst = 0;
    while (dist[cur] == -1) {
    	dist[cur] = lst++;
    	path.pb(cur);
    	cur = A[cur];
    }
    ans[par(1,K)] += (ll)N*(N-sz(path));
}

vi v;
int lst[MX];

void rdfs(int x) {
	v.pb(x); lst[x] = special;
	int rem = (K-dist[special])%sz(v);
	if (rem == 0) ans[v[rem]] ++;
	else ans[v[sz(v)-rem]] ++;
	trav(t,adj[x]) if (t != special) rdfs(t);
	v.pop_back();
}

void process() {
	// ps("HUH",special,dist[special]); exit(0);
	rdfs(special);
	FOR(i,1,N+1) if (lst[i] != special) ans[par(i,K-dist[special]-1)] ++;
}

int main() {
	init();
	set<int> S; FOR(i,1,N+1) S.insert(A[i]);
	if (sz(S) == N) {
		// ps("HA");
		ans[par(1,K)] += sz(path);
		FOR(i,1,N+1) if (dist[i] == -1) ans[i] += sz(path);
		FOR(len,1,sz(path)) {
			int k = K%len;
			ans[path[k]] += len-(k+1); // k+1 to len-1
			ans[path[sz(path)-(len-k)]] += k;
			// continue;
			for (int r = k; ; r += len) {
				int L = max(r-len+1,0); if (L > sz(path)-len) break;
				int R = min(r,sz(path)-len);
				if (r >= sz(path)) {
					ps("??",L,R,r);
					exit(0);
				}
				ans[path[r]] += R-L+1;
			}
			// i from 0 to n-len
			// path[k] up to k 
			// 0 to k: path[k]
			// k+1 to k+len: path[k+len]
			
		}
	} else {
	    trav(t,path) {
	    	special = t;
	    	process();
	    }
	}
    FOR(i,1,N+1) ps(ans[i]);
    exit(0);
}

/* stuff you should look for
    * int overflow, array bounds
    * special cases (n=1?), set tle
    * do smth instead of nothing and stay organized
*/

Compilation message (stderr)

space_pirate.cpp: In function 'void io::setIn(std::__cxx11::string)':
space_pirate.cpp:113:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     void setIn(string s) { freopen(s.c_str(),"r",stdin); }
                            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
space_pirate.cpp: In function 'void io::setOut(std::__cxx11::string)':
space_pirate.cpp:114:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     void setOut(string s) { freopen(s.c_str(),"w",stdout); }
                             ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 37 / 37
• Subtask 3: 33 / 33
• Subtask 4: 0 / 20