Submission #512408

#	Time	Username	Problem	Language	Result	Execution time	Memory
512408		Stickfish	Floppy (RMI20_floppy)	C++17	100 / 100	99 ms	15456 KiB

floppy

#include <stdlib.h>
#include <iostream>
#include <string.h>
#include <vector>
#include "floppy.h"
using namespace std;

void read_array(int subtask_id, const vector<int>& v) {
    int n = v.size();
    string bits = "";
    vector<int> st;
    for (int i = 0; i < n; ++i) {
        while (st.size() && v[i] >= v[st.back()]) {
            st.pop_back();
            bits.push_back('0');
        }
        st.push_back(i);
        bits.push_back('1');
    }
    save_to_floppy(bits);
}

vector<int> get_v(int n, const string& bits) {
    vector<int> ans(n);
    int i = 0;
    int l = bits.size();
    vector<int> st = {-1};
    for (int j = 0; j < l; ++j) {
        if (bits[j] == '0') {
            st.pop_back();
        } else {
            ans[i] = st.back();
            st.push_back(i);
            ++i;
        }
    }
    return ans;
}

vector<int> solve_queries(int subtask_id, int N, const string& bits, const vector<int>& a, const vector<int>& b) {
    vector<int> v = get_v(N, bits);
    //for (int i = 0; i < N; ++i)
        //cout << v[i] << ' ';
    //cout << endl;
    vector<vector<int>> redg(N);
    for (int i = 0; i < N; ++i) {
        if (v[i] == -1)
            continue;
        redg[i].push_back(v[i]);
        for (int j = 1; j - 1 < redg[redg[i][j - 1]].size(); ++j) {
            redg[i].push_back(redg[redg[i][j - 1]][j - 1]);
        }
    }
    int m = a.size();
    vector<int> answers(m);
    for (int i = 0; i < m; ++i) {
        int l = a[i];
        int v = b[i];
        int j = 20;
        while (j >= 0) {
            if (j < redg[v].size() && l <= redg[v][j])
                v = redg[v][j];
            else
                --j;
        }
        //cout << a[i] << ' ' << b[i] << ": " << v << endl;
        answers[i] = v;
    }
    return answers;
}

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:50:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         for (int j = 1; j - 1 < redg[redg[i][j - 1]].size(); ++j) {
      |                         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
floppy.cpp:61:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |             if (j < redg[v].size() && l <= redg[v][j])
      |                 ~~^~~~~~~~~~~~~~~~
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