Submission #144243

#	Time	Username	Problem	Language	Result	Execution time	Memory
144243		Milki	Board (CEOI13_board)	C++14	100 / 100	5 ms	1416 KiB

board

#include<bits/stdc++.h>
using namespace std;

#define FOR(i, a, b) for(int i = a; i < b; ++i)
#define REP(i, n) FOR(i, 0, n)
#define _ << " " <<
#define sz(x) ((int) x.size())
#define pb(x) push_back(x)
#define TRACE(x) cerr << #x << " = " << x << endl

typedef long long ll;
typedef pair<int, int> point;

vector <int> a, b;
string sa, sb;

const int off = 1 << 17;

void update(string &s, vector <int> &v){
  for(auto it : s){
    if(it == '1')
      v.pb(0);
    else if(it == '2')
      v.pb(1);
    else if(it == 'L')
      v.back() --;
    else if(it == 'R')
      v.back() ++;
    else{
      int x = v.back();
      v.pop_back();

      if(x >= 0){
        v.back() += x / 2;
      }
      else{
        v.back() += x / 2;
        x -= x / 2 * 2;
        if(x < 0){
          v.back() --;
        }
      }
    }
  }
}

void prop(vector <int> &v){
  for(int i = sz(v) - 1; i > 0; --i){
    int x = v[i];
    if(x >= 0){
      v[i - 1] += v[i] / 2;
      v[i] %= 2;
    }
    else{
      v[i - 1] += v[i] / 2;
      v[i] -= v[i] / 2 * 2;
      if(v[i] < 0){
        v[i - 1] --;
        v[i] += 2;
      }
    }
  }
}

int main(){
  ios_base::sync_with_stdio(false); cin.tie(0);

  cin >> sa >> sb;
  update(sa, a);
  update(sb, b);
  prop(a); prop(b);

  ll tmp = sz(a) + sz(b), dist = 0;
  ll sol = tmp;
  REP(i, min(sz(a), sz(b))){
    dist <<= 1;
    dist += b[i] - a[i];

    tmp -= 2;
    sol = min(sol, tmp + abs(dist));

    if(dist > 1e13)
      break;
  }
  cout << sol;
}

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