Submission #466731

#	Time	Username	Problem	Language	Result	Execution time	Memory
466731		mtxas	Rack (eJOI19_rack)	C++14	40 / 100	1 ms	312 KiB

rack

#include <bits/stdc++.h>

#define ll long long
#define pii pair<int, int>
#define fi first
#define se second
#define pll pair<ll, ll>
#define mii map<int, int>
#define vi vector<int>
#define vll vector<ll>
#define pb push_back
#define all(a) a.begin(), a.end()
#define sz(x) ((int)x.size())
#define turbo() cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(false)
#define _fre() freopen("input.txt", "r", stdin)
#define _for(a, b, c) for(int (a) = (b); (a) < (c); (a)++)
#define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
#define _forneq(a, b, c) for(int (a) = (b); (a) >= (c); (a)--)
#define _forn(a, b, c) for(int (a) = (b); (a) > (c); (a)--)
using namespace std;
/**********************************************************************************
                                STRUCTS
**********************************************************************************/

/**********************************************************************************
                               VARIABLES
**********************************************************************************/

/**********************************************************************************
                               FUNCTIONS
**********************************************************************************/

/**********************************************************************************
                                 MAIN
**********************************************************************************/
int main(){
    //_fre();
    //freopen("input.txt", "w", stdout);
    turbo();
    ll n, k; cin>>n>>k;
    stack<char> stek;
    ll g = 1; _for(i, 0, n) g*= 2;
    _forneq(h, n, 1){
        int mid = g/2;
        if(k > mid) k-= mid, stek.push('R');
        else stek.push('L');
        g/= 2;
    }
    int v = 1;
    while(!stek.empty()){
        char c= stek.top(); stek.pop();
        if(c == 'L')    v = 2*v;
        else if(c=='R') v = 2*v+1;
    }
    g = 1; _for(i, 0, n) g*= 2;
    cout<<v-g+1;
}

Compilation message (stderr)

rack.cpp: In function 'int main()':
rack.cpp:16:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   16 | #define _for(a, b, c) for(int (a) = (b); (a) < (c); (a)++)
      |                               ^
rack.cpp:42:15: note: in expansion of macro '_for'
   42 |     ll g = 1; _for(i, 0, n) g*= 2;
      |               ^~~~
rack.cpp:18:34: warning: unnecessary parentheses in declaration of 'h' [-Wparentheses]
   18 | #define _forneq(a, b, c) for(int (a) = (b); (a) >= (c); (a)--)
      |                                  ^
rack.cpp:43:5: note: in expansion of macro '_forneq'
   43 |     _forneq(h, n, 1){
      |     ^~~~~~~
rack.cpp:16:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   16 | #define _for(a, b, c) for(int (a) = (b); (a) < (c); (a)++)
      |                               ^
rack.cpp:55:12: note: in expansion of macro '_for'
   55 |     g = 1; _for(i, 0, n) g*= 2;
      |            ^~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 0 / 60