Submission #1093623

#	Time	Username	Problem	Language	Result	Execution time	Memory
1093623		huyngo	Unscrambling a Messy Bug (IOI16_messy)	C++17	100 / 100	2 ms	604 KiB

messy

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

// void add_element(std::string x);
// bool check_element(std::string x);
// void compile_set();

std::vector<int> restore_permutation(int n, int w, int r) {
    vector<int> perm(n);
    // add phase
    auto add = [&](auto self, int l, int r) -> void {
        if (l == r) return;
        int m = (l + r) / 2;
        string s(n, '1');
        for (int i = l; i <= r; ++i) s[i] = '0';
        for (int i = l; i <= m; ++i) {
            s[i] = '1';
            add_element(s);
            s[i] = '0';
        }
        self(self, l, (l + r) / 2);
        self(self, (l + r) / 2 + 1, r);
        };
    add(add, 0, n - 1);
    compile_set();

    auto solve = [&](auto self, int l, int r, vector<int> z) -> void {
        if (l == r) {
            perm[z[0]] = l;
            return;
        }
        int m = (l + r) / 2;
        string s(n, '1');
        for (int i : z) s[i] = '0';
        vector<int> y;
        for (int i : z) {
            s[i] = '1';
            if (check_element(s))
                y.push_back(i);
            s[i] = '0';
        }

        vector<int> t;
        for (int i = 0, j = 0; i < z.size(); ++i) {
            if (j < y.size() && z[i] == y[j])
                ++j;
            else
                t.push_back(z[i]);
        }
        self(self, l, m, y);
        self(self, m + 1, r, t);
        };
    vector<int> z(n, 0);
    iota(z.begin(), z.end(), 0);
    solve(solve, 0, n - 1, z);
    return perm;
}

Compilation message (stderr)

messy.cpp: In lambda function:
messy.cpp:45:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         for (int i = 0, j = 0; i < z.size(); ++i) {
      |                                ~~^~~~~~~~~~
messy.cpp: In instantiation of 'restore_permutation(int, int, int)::<lambda(auto:24, int, int, std::vector<int>)> [with auto:24 = restore_permutation(int, int, int)::<lambda(auto:24, int, int, std::vector<int>)>]':
messy.cpp:56:29:   required from here
messy.cpp:45:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
messy.cpp:46:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |             if (j < y.size() && z[i] == y[j])
      |                 ~~^~~~~~~~~~

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