Submission #464280

#	Time	Username	Problem	Language	Result	Execution time	Memory
464280		taulant	Floppy (RMI20_floppy)	C++17	100 / 100	120 ms	25324 KiB

floppy

#include "bits/stdc++.h"
#include "floppy.h"
using namespace std;

array<int, 2> t[16][42069];

void init(const vector<int>& v){
 int n = v.size();
 for(int i = 0; i < n; ++i) t[0][i] = {v[i], i};
 for(int y = 0; y < 15; ++y){
  int p = 1 << y;
  for(int i = 0; i+p+p <= n; ++i) t[y+1][i] = max(t[y][i], t[y][i+p]);
 }
}

int mx(int l, int r){
 int y = 0, le = 1;
 while(le+le <= r-l) ++y, le *= 2;
 return max(t[y][l], t[y][r-le])[1];
}

void read_array(int st, const vector<int> &v){
 init(v);
 string bits;
 function<void(int, int)> dfs = [&](int l, int r){
  int idx = mx(l, r);
  bits += (idx > l)? "1" : "0";
  bits += (idx < r-1)? "1" : "0";
  if(idx > l) dfs(l, idx);
  if(idx < r-1) dfs(idx+1, r);
 };
 dfs(0, v.size());
 save_to_floppy(bits);
}

vector<int> solve_queries(int st, int n, const string &bits, const vector<int> &a, const vector<int> &b){
 vector<int> v, ans;
 int i = 0;
 function<void(int)> dfs = [&](int d){
  int l = (bits[i++] == '1'), r = (bits[i++] == '1');
  if(l) dfs(d-1);
  v.push_back(d);
  if(r) dfs(d-1);
 };
 dfs(42069);
 init(v);
 for(int i = 0; i < a.size(); ++i) ans.push_back(mx(a[i], b[i]+1));
 return ans;
}

Compilation message (stderr)

floppy.cpp: In function 'std::vector<int> solve_queries(int, int, const string&, const std::vector<int>&, const std::vector<int>&)':
floppy.cpp:47:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |  for(int i = 0; i < a.size(); ++i) ans.push_back(mx(a[i], b[i]+1));
      |                 ~~^~~~~~~~~~
stub.cpp: In function 'void run2()':
stub.cpp:101:30: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  101 |     if (query_answers.size() != M) {
      |         ~~~~~~~~~~~~~~~~~~~~~^~~~

• Subtask 1: 7 / 7
• Subtask 2: 21 / 21
• Subtask 3: 72 / 72