Submission #1037306

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037306		RaresFelix	Unscrambling a Messy Bug (IOI16_messy)	C++17	100 / 100	1 ms	856 KiB

messy

#include <bits/stdc++.h>
#include "messy.h"

using namespace std;

using vi = vector<int>;


vi restore_permutation(int n, int w, int r) {
    vector<vi> S;
    vi V0;
    for(int i = 0; i < n; ++i) V0.push_back(i);

    S = {V0};

    while(S.size() != n) {
        vector<vi> Snou;
        for(auto &V : S) {
            int len = V.size();
            vi V1, V2;
            for(int i = 0; i < len / 2; ++i) V1.push_back(V[i]);
            for(int i = 0; i < len / 2; ++i) V2.push_back(V[i + len / 2]);
            Snou.push_back(V1);
            Snou.push_back(V2);
            string s;
            for(int i = 0; i < n; ++i) s += '0';
            for(auto it : V) s[it] = '1';
            for(auto it : V1) {
                s[it] = '0';
                add_element(s);
                s[it] = '1';
            }
        }
        S = Snou;
    }

    compile_set();
    S = {V0};

    while(S.size() != n) {
        vector<vi> Snou;
        for(auto &V : S) {
            int len = V.size();
            string s;
            for(int i = 0; i < n; ++i) s += '0';
            for(auto it : V) s[it] = '1';
            vi V1, V2;
            for(auto it : V) {
                s[it] = '0';
                auto re = check_element(s);
                if(re) V1.push_back(it);
                else V2.push_back(it);
                s[it] = '1';
            }
            Snou.push_back(V1);
            Snou.push_back(V2);
        }
        S = Snou;
    }
    vi Re(n, 0);
    for(int i = 0; i < n; ++i)
        Re[S[i][0]] = i;
    return Re;
}

Compilation message (stderr)

messy.cpp: In function 'vi restore_permutation(int, int, int)':
messy.cpp:16:20: warning: comparison of integer expressions of different signedness: 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   16 |     while(S.size() != n) {
      |           ~~~~~~~~~^~~~
messy.cpp:40:20: warning: comparison of integer expressions of different signedness: 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   40 |     while(S.size() != n) {
      |           ~~~~~~~~~^~~~
messy.cpp:43:17: warning: unused variable 'len' [-Wunused-variable]
   43 |             int len = V.size();
      |                 ^~~

• Subtask 1: 20 / 20
• Subtask 2: 18 / 18
• Subtask 3: 11 / 11
• Subtask 4: 21 / 21
• Subtask 5: 30 / 30