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답안 #225576

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
225576 2020-04-20T21:56:25 Z rqi 말 (IOI15_horses) C++14
100 / 100
 770 ms 57080 KB 
#include "horses.h"
#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef long double ld;
typedef double db; 
typedef string str; 

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

typedef vector<int> vi; 
typedef vector<ll> vl; 
typedef vector<db> vd; 
typedef vector<str> vs; 
typedef vector<pi> vpi;
typedef vector<pl> vpl; 
typedef vector<pd> vpd; 

#define mp make_pair 
#define f first
#define s second
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) (x).rbegin(), (x).rend() 
#define rsz resize
#define ins insert 
#define ft front() 
#define bk back()
#define pf push_front 
#define pb push_back
#define eb emplace_back 
#define lb lower_bound 
#define ub upper_bound 

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

const int MOD = 1e9+7; // 998244353;
const int MX = 2e5+5; 
const ll INF = 1e18; 
const ld PI = acos((ld)-1);
const int xd[4] = {1,0,-1,0}, yd[4] = {0,1,0,-1}; 

template<class T> bool ckmin(T& a, const T& b) { 
	return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { 
	return a < b ? a = b, 1 : 0; } 
int pct(int x) { return __builtin_popcount(x); } 
int bit(int x) { return 31-__builtin_clz(x); } // floor(log2(x)) 
int cdiv(int a, int b) { return a/b+!(a<0||a%b == 0); } // division of a by b rounded up, assumes b > 0 

// DEBUG
void DBG() { cerr << "]" << endl; }
template<class H, class... T> void DBG(H h, T... t) {
	cerr << to_string(h); if (sizeof...(t)) cerr << ", ";
	DBG(t...); }
#ifdef LOCAL // compile with -DLOCAL
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 42
#endif

// FILE I/O
void setIn(string s) { freopen(s.c_str(),"r",stdin); }
void setOut(string s) { freopen(s.c_str(),"w",stdout); }
void unsyncIO() { ios_base::sync_with_stdio(0); cin.tie(0); }
void setIO(string s = "") {
	unsyncIO();
	// cin.exceptions(cin.failbit); 
	// throws exception when do smth illegal
	// ex. try to read letter into int
	if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
}

mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count()); 

struct mi {
	typedef decay<decltype(MOD)>::type T; 
 	/// don't silently convert to T
	T v; explicit operator T() const { return v; }
	mi() { v = 0; }
	mi(ll _v) { 
		v = (-MOD < _v && _v < MOD) ? _v : _v % MOD;
		if (v < 0) v += MOD;
	}
	friend bool operator==(const mi& a, const mi& b) { 
		return a.v == b.v; }
	friend bool operator!=(const mi& a, const mi& b) { 
		return !(a == b); }
	friend bool operator<(const mi& a, const mi& b) { 
		return a.v < b.v; }
   
	mi& operator+=(const mi& m) { 
		if ((v += m.v) >= MOD) v -= MOD; 
		return *this; }
	mi& operator-=(const mi& m) { 
		if ((v -= m.v) < 0) v += MOD; 
		return *this; }
	mi& operator*=(const mi& m) { 
		v = (ll)v*m.v%MOD; return *this; }
	mi& operator/=(const mi& m) { return (*this) *= inv(m); }
	friend mi pow(mi a, ll p) {
		mi ans = 1; assert(p >= 0);
		for (; p; p /= 2, a *= a) if (p&1) ans *= a;
		return ans;
	}
	friend mi inv(const mi& a) { assert(a.v != 0); 
		return pow(a,MOD-2); }
		
	mi operator-() const { return mi(-v); }
	mi& operator++() { return *this += 1; }
	mi& operator--() { return *this -= 1; }
	friend mi operator+(mi a, const mi& b) { return a += b; }
	friend mi operator-(mi a, const mi& b) { return a -= b; }
	friend mi operator*(mi a, const mi& b) { return a *= b; }
	friend mi operator/(mi a, const mi& b) { return a /= b; }
};
typedef vector<mi> vmi;
typedef pair<mi,mi> pmi;
typedef vector<pmi> vpmi;

vector<vmi> comb;
void genComb(int SZ) {
	comb.assign(SZ,vmi(SZ)); comb[0][0] = 1;
	FOR(i,1,SZ) F0R(j,i+1) 
		comb[i][j] = comb[i-1][j]+(j?comb[i-1][j-1]:0);
}

template<class T> struct MaxSeg { // comb(ID,b) = b
	const T ID = mp(0, 0); T comb(T a, T b) { return max(a, b); } 
	int n; vector<T> seg;
	void init(int _n) { n = _n; seg.assign(2*n,ID); }
	void pull(int p) { seg[p] = comb(seg[2*p],seg[2*p+1]); }
	void upd(int p, T val) { // set val at position p
		seg[p += n] = val; for (p /= 2; p; p /= 2) pull(p); }
	T query(int l, int r) {	// sum on interval [l, r]
		T ra = ID, rb = ID; 
		for (l += n, r += n+1; l < r; l /= 2, r /= 2) {
			if (l&1) ra = comb(ra,seg[l++]);
			if (r&1) rb = comb(seg[--r],rb);
		}
		return comb(ra,rb);
	}
};

template<class T> struct ProdSeg { // comb(ID,b) = b
	const T ID = mi(1); T comb(T a, T b) { return a*b; } 
	int n; vector<T> seg;
	void init(int _n) { n = _n; seg.assign(2*n,ID); }
	void pull(int p) { seg[p] = comb(seg[2*p],seg[2*p+1]); }
	void upd(int p, T val) { // set val at position p
		seg[p += n] = val; for (p /= 2; p; p /= 2) pull(p); }
	T query(int l, int r) {	// sum on interval [l, r]
		if(l > r) return 1;
		T ra = ID, rb = ID; 
		for (l += n, r += n+1; l < r; l /= 2, r /= 2) {
			if (l&1) ra = comb(ra,seg[l++]);
			if (r&1) rb = comb(seg[--r],rb);
		}
		return comb(ra,rb);
	}
};

const int mx = 500005;
int N;
ll X[mx];
ll Y[mx];
MaxSeg<pair<ll, int>> mseg; //value, index of Y[]
ProdSeg<mi> pseg; //X values
set<int> n1pos; //positions of non 1 X values
const ll MAXVAL = ll(MOD);
int query(){
	//ps("QUERY");
	if(sz(n1pos) == 0){
		return int(mseg.query(0, N-1).f);
	}
	ll curprod = 1;
	auto it = n1pos.end();
	while(curprod <= ll(MAXVAL)){
		if(it == n1pos.begin()){
			break;
		}
		it = prev(it);
		int ind = *it;
		curprod*=X[ind];
	}

	pair<ll, mi> curans = mp(0, 0);
	pair<ll, int> q;


	if(it == n1pos.begin()){

		int ind = *it;
		if(ind != 0){
			q = mseg.query(0, ind-1);
			ckmax(curans, mp(q.f, pseg.query(0, q.s)*mi(q.f)));
		}
		curprod = 1;
		while(it != n1pos.end()){
			int r;
			if(next(it) == n1pos.end()){
				r = N; 
			}
			else{
				r = *(next(it));
			}
			curprod*=X[*it];
			q = mseg.query(*it, r-1);
			ckmax(curans, mp(curprod*q.f, pseg.query(0, q.s)*mi(q.f)));
			//ps(*it, curprod, q.f);
			it = next(it);
		}
		return int(curans.s);
	}
	else{
		curprod = 1;
		auto it2 = it;
		while(it != n1pos.end()){
			if(it != it2) curprod*=X[*it];
			int r;
			if(next(it) == n1pos.end()){
				r = N; 
			}
			else{
				r = *(next(it));
			}
			q = mseg.query(*it, r-1);
			//cout << *it << " " << q.f << " " << q.s << " " << curprod*q.f << " " << int(pseg.query(0, q.s)*mi(q.f)) << "\n";
			ckmax(curans, mp(curprod*q.f, pseg.query(0, q.s)*mi(q.f)));
			
			it = next(it);
		}
	return int(curans.s);
	}
	
}

int init(int _N, int x[], int y[]) {
	N = _N;
	for(int i = 0; i < N; i++){
		X[i] = x[i];
		Y[i] = y[i];
	}
	mseg.init(N+5);
	pseg.init(N+5);
	for(int i = 0; i < N; i++){
		mseg.upd(i, mp(Y[i], i));
		pseg.upd(i, mi(X[i]));
		if(X[i] != 1) n1pos.insert(i);
	}
	return query();
}

int updateX(int pos, int val) {	
	if(X[pos] != 1) n1pos.erase(pos);
	pseg.upd(pos, mi(val));
	X[pos] = val;
	if(X[pos] != 1) n1pos.ins(pos);
	return query();
}

int updateY(int pos, int val) {
	//ps(pos, val);
	mseg.upd(pos, mp(ll(val), pos));
	Y[pos] = val;
	return query();
}

Compilation message

horses.cpp: In constructor 'mi::mi(ll)':
horses.cpp:89:31: warning: conversion to 'mi::T {aka int}' from 'll {aka long long int}' may alter its value [-Wconversion]
   v = (-MOD < _v && _v < MOD) ? _v : _v % MOD;
       ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
horses.cpp:89:31: warning: conversion to 'mi::T {aka int}' from 'll {aka long long int}' may alter its value [-Wconversion]
horses.cpp: In member function 'mi& mi::operator*=(const mi&)':
horses.cpp:106:16: warning: conversion to 'mi::T {aka int}' from 'll {aka long long int}' may alter its value [-Wconversion]
   v = (ll)v*m.v%MOD; return *this; }
       ~~~~~~~~~^~~~
horses.cpp: In function 'void setIn(std::__cxx11::string)':
horses.cpp:70:31: 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); }
                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
horses.cpp: In function 'void setOut(std::__cxx11::string)':
horses.cpp:71:32: 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
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 4 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 5 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 4 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 4 ms 256 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 4 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 4 ms 384 KB Output is correct

Subtask #2
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 512 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 4 ms 256 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 4 ms 384 KB Output is correct
17 Correct 4 ms 384 KB Output is correct
18 Correct 4 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 4 ms 384 KB Output is correct
21 Correct 4 ms 384 KB Output is correct
22 Correct 4 ms 384 KB Output is correct
23 Correct 6 ms 384 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 6 ms 512 KB Output is correct
26 Correct 5 ms 512 KB Output is correct
27 Correct 8 ms 384 KB Output is correct
28 Correct 6 ms 512 KB Output is correct
29 Correct 5 ms 384 KB Output is correct
30 Correct 5 ms 512 KB Output is correct
31 Correct 7 ms 384 KB Output is correct
32 Correct 7 ms 384 KB Output is correct

Subtask #3
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 770 ms 56428 KB Output is correct
2 Correct 514 ms 56824 KB Output is correct
3 Correct 511 ms 56696 KB Output is correct
4 Correct 574 ms 56824 KB Output is correct

Subtask #4
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 4 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 4 ms 384 KB Output is correct
13 Correct 4 ms 384 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 4 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 4 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 4 ms 384 KB Output is correct
22 Correct 4 ms 384 KB Output is correct
23 Correct 5 ms 384 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 6 ms 512 KB Output is correct
26 Correct 5 ms 512 KB Output is correct
27 Correct 8 ms 384 KB Output is correct
28 Correct 6 ms 512 KB Output is correct
29 Correct 5 ms 384 KB Output is correct
30 Correct 5 ms 512 KB Output is correct
31 Correct 7 ms 512 KB Output is correct
32 Correct 8 ms 384 KB Output is correct
33 Correct 236 ms 32824 KB Output is correct
34 Correct 233 ms 32760 KB Output is correct
35 Correct 377 ms 56088 KB Output is correct
36 Correct 363 ms 56056 KB Output is correct
37 Correct 288 ms 32508 KB Output is correct
38 Correct 293 ms 44152 KB Output is correct
39 Correct 246 ms 32208 KB Output is correct
40 Correct 355 ms 56056 KB Output is correct
41 Correct 255 ms 32248 KB Output is correct
42 Correct 270 ms 32248 KB Output is correct
43 Correct 346 ms 56056 KB Output is correct
44 Correct 342 ms 56060 KB Output is correct

Subtask #5
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 4 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 4 ms 384 KB Output is correct
13 Correct 4 ms 384 KB Output is correct
14 Correct 4 ms 384 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 4 ms 384 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 4 ms 384 KB Output is correct
22 Correct 4 ms 384 KB Output is correct
23 Correct 5 ms 512 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 6 ms 512 KB Output is correct
26 Correct 5 ms 488 KB Output is correct
27 Correct 7 ms 384 KB Output is correct
28 Correct 6 ms 512 KB Output is correct
29 Correct 5 ms 384 KB Output is correct
30 Correct 5 ms 512 KB Output is correct
31 Correct 6 ms 384 KB Output is correct
32 Correct 12 ms 512 KB Output is correct
33 Correct 726 ms 56952 KB Output is correct
34 Correct 528 ms 56940 KB Output is correct
35 Correct 521 ms 57080 KB Output is correct
36 Correct 594 ms 57044 KB Output is correct
37 Correct 234 ms 32632 KB Output is correct
38 Correct 237 ms 32632 KB Output is correct
39 Correct 380 ms 56184 KB Output is correct
40 Correct 365 ms 56056 KB Output is correct
41 Correct 273 ms 32376 KB Output is correct
42 Correct 285 ms 44256 KB Output is correct
43 Correct 242 ms 32248 KB Output is correct
44 Correct 345 ms 56056 KB Output is correct
45 Correct 257 ms 32248 KB Output is correct
46 Correct 272 ms 32248 KB Output is correct
47 Correct 348 ms 55928 KB Output is correct
48 Correct 340 ms 56024 KB Output is correct
49 Correct 318 ms 34552 KB Output is correct
50 Correct 321 ms 34600 KB Output is correct
51 Correct 495 ms 56952 KB Output is correct
52 Correct 454 ms 57080 KB Output is correct
53 Correct 644 ms 34584 KB Output is correct
54 Correct 451 ms 47396 KB Output is correct
55 Correct 316 ms 32632 KB Output is correct
56 Correct 429 ms 56972 KB Output is correct
57 Correct 507 ms 33400 KB Output is correct
58 Correct 619 ms 33656 KB Output is correct
59 Correct 341 ms 55928 KB Output is correct