Submission #320727

#	Time	Username	Problem	Language	Result	Execution time	Memory
320727		monus1042	Board (CEOI13_board)	C++17	30 / 100	1047 ms	876 KiB

board

// NK
#include <bits/stdc++.h>
 
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
 
using namespace std;
//using namespace __gnu_pbds;
 
typedef pair<int,int> ii;
typedef int ll;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<ll> vll;
#define pb push_back
#define eb emplace_back
#define pob pop_back
#define psf push_front
#define pof pop_front
#define mkp make_pair
#define mkt make_tuple
#define all(x) x.begin(), x.end()
#define Bolivia_is_nice ios::sync_with_stdio(false), cin.tie(nullptr)
 
//typedef tree<ii, null_type, less<ii>, rb_tree_tag, tree_order_statistics_node_update> ord_set;
 
const int MAXS = 2000;
string unit(MAXS, '0');
 
string sum(string a, string b){
	string r(MAXS, '0');
	char carry = '0';	
	for (int i=0; i<MAXS; i++){
		int c1 = 0;
		if (a[i] == '1') c1++;
		if (b[i] == '1') c1++;
		if (carry == '1') c1++;
		
		if (c1 == 1 || c1 == 3) r[i] = '1';
		
		if (c1 >= 2) carry = '1';
		else carry = '0';
	}
	return r;
}
 
string mult(string a){
	string r(MAXS, '0');
	for (int i=0; i<MAXS - 1; i++){
		if (a[i] == '1') r[i+1] = '1';
	}
	return r;
}
 
string divi(string a){
	string r(MAXS, '0');
	for (int i=1; i<MAXS; i++){
		if (a[i] == '1') r[i-1] = '1';
	}
	return r;
}
 
string complem(string a){
	string r(MAXS, '0');
	for (int i=0; i<MAXS; i++){
		if (a[i] == '1') r[i] = '0';
		if (a[i] == '0') r[i] = '1';
	}
	return r;
}
 
string sub(string a, string b){
	string aux = complem(b);
	a = sum(a, aux);
	a = sum(a, unit);
	return a;
}
 
string locationof(string s, string nod, string & lev){
	for (int i=0; i<s.size(); i++){
		if (s[i] == '1'){
			nod = mult(nod);
			lev = sum(lev, unit);
		}else if (s[i] == '2'){
			nod = mult(nod);
			nod = sum(nod, unit);
			lev = sum(lev, unit);
		}else if (s[i] == 'U'){
			nod = divi(nod);
			lev = sub(lev, unit);
		}else if (s[i] == 'L'){
			nod = sub(nod, unit);
		}else{ // R
			nod = sum(nod, unit);
		}
	}
	return nod;
}
 
void solve(){
	string a,b; cin>>a>>b;
	string AL (MAXS, '0'), BL (MAXS, '0');
	unit[0] = '1';
	string A = locationof(a, unit, AL), B = locationof(b, unit, BL);
 
    string auxa(AL), auxb(BL);
	reverse(all(auxa)); reverse(all(auxb));
 
	if (auxa < auxb){
		swap(auxa, auxb);
		swap(AL, BL);
		swap(A, B);
	}
 
	string diff = sub(AL, BL);
	ll num = 0;
	for (ll i=0; i<31; i++){
		if (diff[i] == '1'){
			num += (1LL << i);
		}
	}
	for (ll i=0; i<num; i++){
		AL = sub(AL, unit);
		A = divi(A);
	}
 
	///
	string ans(MAXS, '1');
	auxa = A, auxb = B;
	reverse(all(auxa)); reverse(all(auxb));
	if (auxa > auxb) swap(A, B), swap(auxa, auxb);
	string acc(MAXS, '0');
	while(1){
		bool ok = 0;
		for (int i=0; i<MAXS; i++){
			if (A[i] == '1') ok = 1;
		}
		if (!ok) break;
 
		string current = diff;
		string HOR = sub(B, A);
		current = sum(current, HOR);
		current = sum(current, acc);
		reverse(all(current));
		reverse(all(ans));
		ans = min(ans, current);
		reverse(all(ans));
		// lift:
		acc = sum(acc, unit);
		acc = sum(acc, unit);
		A = divi(A);
		B = divi(B);
	}
	ll Answer = 0;
	for (ll i=0; i<31; i++){
		if (ans[i] == '1'){
			Answer += (1LL << i);
		}
	}
	cout<<Answer<<'\n';
}
 
int main(){
	Bolivia_is_nice;
	int t = 1; //cin>>t;
	while(t--)
	solve();
	
	return 0;
}
/*
  ~/.emacs
*/

Compilation message (stderr)

board.cpp: In function 'std::string locationof(std::string, std::string, std::string&)':
board.cpp:80:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |  for (int i=0; i<s.size(); i++){
      |                ~^~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 10 / 10
• Subtask 4: 0 / 10
• Subtask 5: 10 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10