oj.uz

Submission #259430

# Submission time Handle Problem Language Result Execution time Memory
259430 2020-08-07T19:24:24 Z Benq Swap (BOI16_swap) C++14
100 / 100
 128 ms 23160 KB 
#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}; 
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count()); 
 
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; } 
constexpr int pct(int x) { return __builtin_popcount(x); } 
constexpr int bits(int x) { return 31-__builtin_clz(x); } // floor(log2(x)) 
ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
ll half(ll x) { return fdiv(x,2); }
 
template<class T, class U> T fstTrue(T lo, T hi, U f) { 
	// note: if (lo+hi)/2 is used instead of half(lo+hi) then this will loop infinitely when lo=hi
	hi ++; assert(lo <= hi); // assuming f is increasing
	while (lo < hi) { // find first index such that f is true 
		T mid = half(lo+hi);
		f(mid) ? hi = mid : lo = mid+1; 
	} 
	return lo;
}
template<class T, class U> T lstTrue(T lo, T hi, U f) {
	lo --; assert(lo <= hi); // assuming f is decreasing
	while (lo < hi) { // find first index such that f is true 
		T mid = half(lo+hi+1);
		f(mid) ? lo = mid : hi = mid-1;
	} 
	return lo;
}
template<class T> void remDup(vector<T>& v) { 
	sort(all(v)); v.erase(unique(all(v)),end(v)); }
 
// INPUT
template<class A> void re(complex<A>& c);
template<class A, class B> void re(pair<A,B>& p);
template<class A> void re(vector<A>& v);
template<class A, size_t SZ> void re(array<A,SZ>& a);
 
template<class T> void re(T& x) { cin >> x; }
void re(db& d) { str t; re(t); d = stod(t); }
void re(ld& d) { str t; re(t); d = stold(t); }
template<class H, class... T> void re(H& h, T&... t) { re(h); re(t...); }
 
template<class A> void re(complex<A>& c) { A a,b; re(a,b); c = {a,b}; }
template<class A, class B> void re(pair<A,B>& p) { re(p.f,p.s); }
template<class A> void re(vector<A>& x) { trav(a,x) re(a); }
template<class A, size_t SZ> void re(array<A,SZ>& x) { trav(a,x) re(a); }
 
// TO_STRING
#define ts to_string
str ts(char c) { return str(1,c); }
str ts(const char* s) { return (str)s; }
str ts(str s) { return s; }
str ts(bool b) { 
	#ifdef LOCAL
		return b ? "true" : "false"; 
	#else 
		return ts((int)b);
	#endif
}
template<class A> str ts(complex<A> c) { 
	stringstream ss; ss << c; return ss.str(); }
str ts(vector<bool> v) {
	str res = "{"; F0R(i,sz(v)) res += char('0'+v[i]);
	res += "}"; return res; }
template<size_t SZ> str ts(bitset<SZ> b) {
	str res = ""; F0R(i,SZ) res += char('0'+b[i]);
	return res; }
template<class A, class B> str ts(pair<A,B> p);
template<class T> str ts(T v) { // containers with begin(), end()
	#ifdef LOCAL
		bool fst = 1; str res = "{";
		for (const auto& x: v) {
			if (!fst) res += ", ";
			fst = 0; res += ts(x);
		}
		res += "}"; return res;
	#else
		bool fst = 1; str res = "";
		for (const auto& x: v) {
			if (!fst) res += " ";
			fst = 0; res += ts(x);
		}
		return res;
 
	#endif
}
template<class A, class B> str ts(pair<A,B> p) {
	#ifdef LOCAL
		return "("+ts(p.f)+", "+ts(p.s)+")"; 
	#else
		return ts(p.f)+" "+ts(p.s);
	#endif
}
 
// OUTPUT
template<class A> void pr(A x) { cout << ts(x); }
template<class H, class... T> void pr(const H& h, const T&... t) { 
	pr(h); pr(t...); }
void ps() { pr("\n"); } // print w/ spaces
template<class H, class... T> void ps(const H& h, const T&... t) { 
	pr(h); if (sizeof...(t)) pr(" "); ps(t...); }
 
// DEBUG
void DBG() { cerr << "]" << endl; }
template<class H, class... T> void DBG(H h, T... t) {
	cerr << ts(h); if (sizeof...(t)) cerr << ", ";
	DBG(t...); }
#ifdef LOCAL // compile with -DLOCAL, chk -> fake assert
	#define dbg(...) cerr << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
	#define chk(...) if (!(__VA_ARGS__)) cerr << "Line(" << __LINE__ << ") -> function(" \
		 << __FUNCTION__  << ") -> CHK FAILED: (" << #__VA_ARGS__ << ")" << "\n", exit(0);
#else
	#define dbg(...) 0
	#define chk(...) 0
#endif
 
// FILE I/O
void setIn(str s) { freopen(s.c_str(),"r",stdin); }
void setOut(str s) { freopen(s.c_str(),"w",stdout); }
void unsyncIO() { ios_base::sync_with_stdio(0); cin.tie(0); }
void setIO(str 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
}
 
int n, p[MX];
int par[MX];
vi val[MX], child[MX];
 
int qmin(int x) {
	if (!par[x]) { assert(p[x]); return p[x]; }
	assert(p[x] == 0);
	x = par[x];
	int res = MOD;
	while (x) {
		// dbg("CURRENT",x);
		assert(sz(val[x]));
		trav(t,val[x]) ckmin(res,t);
		if (sz(val[x]) == 2) {
			assert(!par[x]);
			break;
		} else {
			assert(sz(val[x]) == 1 && par[x]);
			x = par[x];
		}
	}
	assert(res != MOD);
	return res;
}
 
void delChild(int a, int b) {
	assert(a && par[b] == a);
	auto it = find(all(child[a]),b); assert(it != end(child[a]));
	child[a].erase(it); par[b] = 0;
}
 
void setChild(int a, int b) {
	assert(a); child[a].pb(b); 
	par[b] = a; // assert(p[b]); 
	p[b] = 0;
}
 
void setEq(int x) {
	if (p[x]) return;
	int v = qmin(x);
	vi trail = {x};
	while (find(all(val[trail.bk]),v) == end(val[trail.bk])) {
		assert(trail.bk);
		trail.pb(par[trail.bk]);
	}
	// dbg("SETEQ",x,trail);
	for (;sz(trail) > 1;trail.pop_back()) {
		int t = trail.bk; assert(sz(val[t]) && sz(child[t]) == 2);
		int c = trail[sz(trail)-2], C = child[t][0]+child[t][1]-c;
		val[c].pb(v); delChild(t,c); delChild(t,C);
		if (sz(val[t]) == 2) {
			val[C].pb(val[t][0]+val[t][1]-v);
		} else {
			int P = par[t];
			delChild(P,t); setChild(P,C);
		}
	}
}
 
 
int main() {
	setIO(); re(n); 
	FOR(i,1,n+1) re(p[i]);
	FOR(i,1,n+1) {
		// dbg("DOING",i);
		if (!par[i] && sz(val[i])) {
			assert(sz(val[i]) == 1 && p[i] == 0);
			p[i] = val[i][0]; val[i] = {};
		}
		// dbg("HUH",i,p[i],par[i]);
		int x = qmin(i); int mn = x;
		if (2*i <= n) ckmin(mn,p[2*i]);
		if (2*i+1 <= n) ckmin(mn,p[2*i+1]);
		if (mn == x) setEq(i); // just remove the min
		else if (mn == p[2*i]) { // don't touch p[2*i+1]
			if (!par[i]) p[2*i] = p[i];
			else {
				int P = par[i];
				delChild(P,i);
				setChild(P,2*i);
			}
		} else {
			if (!par[i]) val[i] = {p[i],p[2*i]};
			else val[i] = {p[2*i]};
			setChild(i,2*i), setChild(i,2*i+1);
		}
		pr(mn,' ');
		// FOR(z,1,n+1) dbg(z,p[z],par[z],child[z],val[z]);
	}
	// ps("OK");
	// you should actually read the stuff at the bottom
}
 
/* stuff you should look for
	* int overflow, array bounds
	* special cases (n=1?)
	* do smth instead of nothing and stay organized
	* WRITE STUFF DOWN
*/

Compilation message

swap.cpp: In function 'void setIn(str)':
swap.cpp:166:28: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
 void setIn(str s) { freopen(s.c_str(),"r",stdin); }
                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
swap.cpp: In function 'void setOut(str)':
swap.cpp:167:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
 void setOut(str s) { freopen(s.c_str(),"w",stdout); }
                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 6 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 6 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 6 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9728 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 6 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 6 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9728 KB Output is correct
11 Correct 7 ms 9728 KB Output is correct
12 Correct 7 ms 9728 KB Output is correct
13 Correct 7 ms 9728 KB Output is correct
14 Correct 7 ms 9856 KB Output is correct
15 Correct 9 ms 9856 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 6 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 6 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9728 KB Output is correct
11 Correct 7 ms 9728 KB Output is correct
12 Correct 7 ms 9728 KB Output is correct
13 Correct 7 ms 9728 KB Output is correct
14 Correct 7 ms 9856 KB Output is correct
15 Correct 9 ms 9856 KB Output is correct
16 Correct 30 ms 11844 KB Output is correct
17 Correct 30 ms 11896 KB Output is correct
18 Correct 29 ms 11904 KB Output is correct
19 Correct 37 ms 13048 KB Output is correct
20 Correct 36 ms 13048 KB Output is correct

Subtask #5
32.0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 6 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 6 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9728 KB Output is correct
11 Correct 7 ms 9728 KB Output is correct
12 Correct 7 ms 9728 KB Output is correct
13 Correct 7 ms 9728 KB Output is correct
14 Correct 7 ms 9856 KB Output is correct
15 Correct 9 ms 9856 KB Output is correct
16 Correct 30 ms 11844 KB Output is correct
17 Correct 30 ms 11896 KB Output is correct
18 Correct 29 ms 11904 KB Output is correct
19 Correct 37 ms 13048 KB Output is correct
20 Correct 36 ms 13048 KB Output is correct
21 Correct 114 ms 18424 KB Output is correct
22 Correct 123 ms 18424 KB Output is correct
23 Correct 102 ms 18424 KB Output is correct
24 Correct 127 ms 23160 KB Output is correct
25 Correct 128 ms 23160 KB Output is correct