Submission #649981

#	Time	Username	Problem	Language	Result	Execution time	Memory
649981		daria	Floppy (RMI20_floppy)	C++14	100 / 100	655 ms	26376 KiB

floppy

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

const int F = (1 << 16);

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

void dfs(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(mx);
 bit[mx] += (id == l) ? '0' : '1';
 bit[mx] += (id == r-1) ? '0' : '1';
 ans += bit[mx];
 if(id != l) dfs(v, l, id, mx);
 if(id != r-1) dfs(v, id+1, r, mx);
}

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;
 dfs(v1, 0, n, -1);
 //cout << ans << endl;
 save_to_floppy(ans);
}

//-------------------------------------------------------------------------------------------------

vector<int> ar;
bool vis[F];
int nxt = 0;

void rdfs(int id, int z, const string &s){
 if(vis[id]) return;
 vis[id] = 1;
 if(s[2*id] == '1') rdfs(id+1, z+1, s);
 ar.push_back(z);
 if(s[2*id+1] == '1'){
  while(vis[nxt]) nxt++;
  rdfs(nxt, z+1, s);
 }
}

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 &s,
const std::vector<int> &a, const std::vector<int> &b) {
 rdfs(0, 0, s);
 //for(int i=0; i<ar.size(); ++i) cout << ar[i] << " "; cout << endl;
 for(int i=0; i<N; ++i) st[F+i] = {ar[i], 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;
}

// l = sz(figlio sinistro) + l(padre) + (é figlio destro?)
//1223200
//1202312
//1202312

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:69:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |  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: 7 / 7
• Subtask 2: 21 / 21
• Subtask 3: 72 / 72