Submission #226875

#	Time	Username	Problem	Language	Result	Execution time	Memory
226875		rqi	Wiring (IOI17_wiring)	C++14	100 / 100	95 ms	19340 KiB

wiring

#include "wiring.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 

// 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
template<class A, class B> str ts(pair<A,B> p);
template<class A> str ts(complex<A> c) { return ts(mp(c.real(),c.imag())); }
str ts(bool b) { return b ? "true" : "false"; }
str ts(char c) { str s = ""; s += c; return s; }
str ts(str s) { return s; }
str ts(const char* s) { return (str)s; }
str ts(vector<bool> v) { 
	bool fst = 1; str res = "{";
	F0R(i,sz(v)) {
		if (!fst) res += ", ";
		fst = 0; res += ts(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 T> str ts(T v) {
	bool fst = 1; str res = "{";
	for (const auto& x: v) {
		if (!fst) res += ", ";
		fst = 0; res += ts(x);
	}
	res += "}"; return res;
}
template<class A, class B> str ts(pair<A,B> p) {
	return "("+ts(p.f)+", "+ts(p.s)+")"; }

// 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 << 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()); 

int runnum = 0;
vi runs[100005];

long long min_total_length(vector<int> _r, vector<int> _b) {
	vl r;
	vl b;
	vector<pair<ll, bool>> rb;
	for(auto u: _r){
		r.pb(ll(u));
		rb.pb(mp(ll(u), 0));
	}
	for(auto u: _b){
		b.pb(ll(u));
		rb.pb(mp(ll(u), 1));
	}
	sort(all(rb));
	vl cclose;
	for(int i = 0; i < sz(rb); i++){
		ll pos = rb[i].f;
		bool typ = rb[i].s;
		ll cpos;
		ll dist = INF;
		if(typ == 0){
			auto it1 = lb(all(b), pos);
			if(it1 != b.end()){
				ckmin(dist, abs(pos-*it1));
			}
			if(it1 != b.begin()){
				auto it2 = prev(it1);
				ckmin(dist, abs(pos-*it2));
			}
		}
		else{
			auto it1 = lb(all(r), pos);
			if(it1 != r.end()){
				ckmin(dist, abs(pos-*it1));
			}
			if(it1 != r.begin()){
				auto it2 = prev(it1);
				ckmin(dist, abs(pos-*it2));
			}
		}
		cclose.pb(dist);
	}

	for(int i = 0; i < sz(rb); i++){
		if(i == 0 || (rb[i].s != rb[i-1].s)){
			runnum++;
		}
		runs[runnum].pb(i);
	}
	vector<pair<int, ll>> to(sz(rb), mp(-1, INF));
	for(int i = 2; i <= runnum; i++){
		for(int j = 0; j < min(sz(runs[i]), sz(runs[i-1])); j++){
			int ind = runs[i][j];
			int cind = runs[i-1][sz(runs[i-1])-1-j];
			ll pdist = 0;
			if(j > 0) pdist+=to[ind-1].s;
			//ps(ind, cind, pdist);
			pdist+=rb[ind].f-rb[cind].f;
			to[ind] = mp(cind, pdist);
		}
	}


	/*ps("rb", rb);
	for(int i = 1; i <= runnum; i++){
		ps("run[" + to_string(i)+"]", runs[i]);
	}
	ps("to", to);*/

	vl dp(sz(rb), INF);
	for(int i = 0; i < sz(rb); i++){
		if(i == 0){
			ckmin(dp[i], cclose[i]);
		}
		else ckmin(dp[i], dp[i-1]+cclose[i]);
		int cind = to[i].f;
		ll val = to[i].s;
		if(cind == -1) continue;
		if(cind == 0){
			ckmin(dp[i], val);
		}
		else ckmin(dp[i], dp[cind-1]+val);
	}
	return dp[sz(rb)-1];
}

/*int main(){
	int n, m;
	cin >> n >> m;
	vi r, b;
	for(int i = 0; i < n; i++){
		int a;
		cin >> a;
		r.pb(a);
	}
	for(int i = 0; i < m; i++){
		int a;
		cin >> a;
		b.pb(a);
	}
	ps(min_total_length(r, b));
}*/

Compilation message (stderr)

wiring.cpp: In function 'long long int min_total_length(std::vector<int>, std::vector<int>)':
wiring.cpp:157:6: warning: unused variable 'cpos' [-Wunused-variable]
   ll cpos;
      ^~~~
wiring.cpp: In function 'void setIn(std::__cxx11::string)':
wiring.cpp:124:31: 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); }
                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
wiring.cpp: In function 'void setOut(std::__cxx11::string)':
wiring.cpp:125:32: 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: 7 / 7
• Subtask 2: 13 / 13
• Subtask 3: 10 / 10
• Subtask 4: 25 / 25
• Subtask 5: 45 / 45