Submission #932974

#	Time	Username	Problem	Language	Result	Execution time	Memory
932974		skyvn97	Martian DNA (IOI16_dna)	C++14	11 / 100	25 ms	600 KiB

dna

#ifndef SKY
#include "dna.h"
#endif // SKY

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

#ifdef SKY

string analyse(int, int);

struct Jury {
    static const int QUERY_LIMIT = 256;

    string s;
    int queryCount;

    void init(void) {
        int len = rand() % 10 + 1;
        s.clear();
        for (int i = 0; i < len; i++) s.push_back(rand() % 2 ? '0' : '1');

        queryCount = 0;
    }

    bool make_test(const string &p) {
        assert(++queryCount <= QUERY_LIMIT);

        if (p.size() > s.size()) return false;
        for (int i = 0; i <= s.size() - p.size(); i++) {
            bool ok = true;
            for (int j = 0; j < p.size(); j++) if (s[i + j] != p[j]) {
                ok = false; break;
            }
            if (ok) return true;
        }
        return false;
    }

    void process(void) {
        string r = analyse(s.size(), QUERY_LIMIT);
        assert(r == s);

        if (r != s) printf("Expected %s, received %s\n", s.c_str(), r.c_str());
        else printf("ACCEPTED after %d queries\n", queryCount);
    }
} jury;

bool make_test(string p) {
    return jury.make_test(p);
}

#endif // SKY

std::string analyse(int n, int t) {
    if (!make_test("1")) return string(n, '0');

    string res = "1";

    while ((int)res.size() < n) {
        if (make_test(res + "0")) res += "0";
        else if (make_test(res + "1")) res += "1";
        else if (make_test("0" + res)) res = "0" + res;
        else res = "1" + res;
    }

    return res;
}

#ifdef SKY

int main(void) {
    for (int i = 0; i < 1000; i++) {
        jury.init();
        jury.process();
    }
    return 0;
}

#endif // SKY

Compilation message (stderr)

grader.cpp: In function 'bool make_test(std::string)':
grader.cpp:14:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |  for (int i = 0; i < p.size(); i++) {
      |                  ~~^~~~~~~~~~
grader.cpp:23:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |  for (int i = 1; i <= ss.size(); i++) {
      |                  ~~^~~~~~~~~~~~
grader.cpp:28:13: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |   if (pr[i] == p.size()) {

• Subtask 1: 11 / 11
• Subtask 2: 0 / 25
• Subtask 3: 0 / 64