Submission #963368

#	Time	Username	Problem	Language	Result	Execution time	Memory
963368		biank	Hidden Sequence (info1cup18_hidden)	C++14	100 / 100	5 ms	1460 KiB

hidden

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

using namespace std;

#define sz(x) int(x.size())

int query(int k, int a, int b) {
    vector<int> s(a, k);
    while (b--) s.push_back(k ^ 1);
    return k ^ 1 ^ isSubsequence(s);
}

vector<int> findSequence(int N) {
    vector<int> s0, s1;
    int n = 0, k = -1;
    while (true) {
        s0.push_back(0);
        if (!isSubsequence(s0)) {
            k = 0;
            break;
        }
        s1.push_back(1);
        if (!isSubsequence(s1)) {
            k = 1;
            break;
        }
        n++;
    }
    int m = N - n;
    vector<int> ans;
    int i = 0, j = 0;
    while (i < n && j < m) {
        int x = -1;
        if (i + m - j < j + n - i) {
            x = query(k, i + 1, m - j);
        } else {
            x = query(k ^ 1, j + 1, n - i);
        }
        if (x == k) i++;
        else j++;
        ans.push_back(x);
    }
    while (i < n) ans.push_back(k), i++;
    while (j < m) ans.push_back(k ^ 1), j++;
    return ans;
}

Compilation message (stderr)

grader.cpp: In function 'int main()':
grader.cpp:28:26: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wformat=]
   28 |     fprintf (fifo_out, "%d\n", ans.size ());
      |                         ~^     ~~~~~~~~~~~
      |                          |              |
      |                          int            std::vector<int>::size_type {aka long unsigned int}
      |                         %ld
grader.cpp:29:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for (int i=0; i<ans.size () && i < N; i++)
      |                   ~^~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 80 / 80