Submission #404053

#	Time	Username	Problem	Language	Result	Execution time	Memory
404053		danielcm585	Floppy (RMI20_floppy)	C++14	0 / 100	1148 ms	15360 KiB

floppy

#include "floppy.h"

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

#define fi first
#define se second

typedef pair<int,int> ii;

struct node {
    node *lf, *rg;
    int l, r;
    ii val;

    node(int x, int y): l(x), r(y) {}

    void build(vector<int> v) {
        if (l == r) {
            val = ii(v[l],l);
            return;
        }
        int mid = (l+r)/2;
        lf = new node(l,mid); lf->build(v);
        rg = new node(mid+1,r); rg->build(v);
        val = max(lf->val,rg->val);
    }

    ii query(int x, int y) {
        if (l > y || r < x) return ii(-1,-1);
        if (l >= x && r <= y) return val;
        return max(lf->query(x,y),rg->query(x,y));
    }

} *st;

vector<int> compress(vector<int> v) {
    vector<int> tmp, res;
    map<int,int> num;
    tmp = v;
    sort(tmp.begin(),tmp.end());
    tmp.resize(unique(tmp.begin(),tmp.end())-tmp.begin());
    for (int i = 0; i < tmp.size(); i++) num[tmp[i]] = i;
    for (auto i : v) res.push_back(num[i]);
    return res;
}

void read_array(int subtask_id, const vector<int> &v) {
    string bits;
    stack<int> s;
    vector<int> val;
    val = compress(v);
    for (auto i : val) {
        while (!s.empty() && s.top() < i) {
            bits += '0';
            s.pop();
        }
        bits += '1';
        s.push(i);
    }
    save_to_floppy(bits);
}

vector<int> solve_queries(int subtask_id, int N, const string &bits, const vector<int> &l, const vector<int> &r) {
    stack<int> s;
    vector<int> val(N,-1), ls(N), res;
    for (int i = 0, j = 0; i < bits.length(); i++) {
        if (bits[i] == '1') {
            if (s.empty()) ls[j] = j;
            else ls[j] = s.top();
            s.push(j++);
        }
        else s.pop();
    }
    for (int i = N-1, j = N-1; i >= 0; i--) {
        if (!i || ls[i-1] != ls[i]) val[i] = j--;
    }
    for (int i = 0, j = 0; i < N; i++) {
        if (val[i] == -1) val[i] = j++;
    }
    st = new node(0,N-1); st->build(val);
    for (int i = 0; i < l.size(); i++) {
        auto ans = st->query(l[i],r[i]);
        res.push_back(ans.se);
    }
    return res;
}

Compilation message (stderr)

floppy.cpp: In function 'std::vector<int> compress(std::vector<int>)':
floppy.cpp:43:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for (int i = 0; i < tmp.size(); i++) num[tmp[i]] = i;
      |                     ~~^~~~~~~~~~~~
floppy.cpp: In function 'std::vector<int> solve_queries(int, int, const string&, const std::vector<int>&, const std::vector<int>&)':
floppy.cpp:67:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |     for (int i = 0, j = 0; i < bits.length(); i++) {
      |                            ~~^~~~~~~~~~~~~~~
floppy.cpp:82:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |     for (int i = 0; i < l.size(); i++) {
      |                     ~~^~~~~~~~~~
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