Submission #649745

#	Time	Username	Problem	Language	Result	Execution time	Memory
649745		daria	Floppy (RMI20_floppy)	C++17	0 / 100	132 ms	31116 KiB

floppy

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

const int F = (1 << 17);
int n;
string ans;
vector<string> bit(F, "");
vector<int> adj[F];

void dfs(int s){
 ans += bit[s];
 for(auto u : adj[s]) dfs(u);
}

void solve(const vector<int> &v, int l, int r, int p){
 int mx = -1, id = -1;
 for(int i=l; i<r; ++i)
  if(v[i] > mx){ mx = v[i]; id = i;}

 if(p != -1) adj[p].push_back(v[id]);

 if(id == l) bit[v[id]] += '0';
 else bit[v[id]] += '1';
 if(id == r-1) bit[v[id]] += '0';
 else bit[v[id]] += '1';

 if(id != l) solve(v, l, id, v[id]);
 if(id != r-1) solve(v, id+1, r, v[id]);
}

void read_array(int subtask_id, const std::vector<int> &v) {
 n = v.size();
 vector<pair<int, int> > v0(n);
 for(int i=0; i<n; ++i) v0[i] = {v[i], i};
 sort(v0.begin(), v0.end());
 vector<int> v1(n);
 for(int i=0; i<n; ++i) v1[v0[i].second] = i;
 solve(v1, 0, n, -1);

 dfs(n-1);
 //cout << ans << endl;
 save_to_floppy(ans);
}

vector<int> sz(F, 1), l(F, 0), val(F, 0);
bool vis[F];
int nxt = 0;

void rdfs(int id, int z, const string &st){
 //cout << id << endl;
 if(vis[id]) return;
 vis[id] = 1;
 val[id] = z;
 if(st[2*id] == '1'){
  l[id+1] += l[id];
  //cout << "+ l padre: " << id+1 << " " << l[id+1] << endl;
  rdfs(id+1, z+1, st);
  sz[id] += sz[id+1];
  l[id] += sz[id+1];
  //cout << "+ sz figlio sx: " <<id << " " << l[id] << endl;
}
 if(st[2*id+1] == '1'){
  while(vis[nxt]) nxt++;
  l[nxt] += l[id] + 1;
  rdfs(nxt, z+1, st);
  sz[id] += sz[nxt];
  //cout << "+ l padre + 1: " << nxt << " " << l[nxt] << endl;
 }
}

vector<pair<int, int> > st(2*F, {F, -1});

pair<int, int> query(int v, int tl, int tr, int l, int r){
 if(r <= tl || tr <= l) return {F, -1};
 if(l <= tl && tr <= r) return st[v];
 int tm = (tl +tr)/2;
 return min(query(2*v, tl, tm, l, r), query(2*v+1, tm, tr, l , r));
}

std::vector<int> solve_queries(int subtask_id,
int n,const std::string &bits,
const std::vector<int> &a, const std::vector<int> &b) {
 rdfs(0, 0, bits);
 vector<int> v(n);
 for(int i=0; i<n; ++i) st[F+l[i]] = {val[i], l[i]};

 for(int i=F-1; i>0; --i) st[i] = min(st[2*i], st[2*i+1]);
 vector<int> res;
 for(int i=0; i<a.size(); ++i) res.push_back(query(1, 0, F, a[i], b[i]+1).second);
 res.resize(a.size());
 return res;
}

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:90:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   90 |  for(int i=0; i<a.size(); ++i) res.push_back(query(1, 0, F, a[i], b[i]+1).second);
      |               ~^~~~~~~~~
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: 0 / 7
• Subtask 2: 0 / 21
• Subtask 3: 0 / 72