Submission #439707

#	Time	Username	Problem	Language	Result	Execution time	Memory
439707		zxcvbnm	Martian DNA (IOI16_dna)	C++14	100 / 100	15 ms	392 KiB

dna

#include "dna.h"

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

std::string analyse(int n, int t) {
    // randame ilgiausia eile, turincia tik nulius
    int l = 0, r = n+1, ans = 0;
    while(l <= r) {
        int mid = (l + r) / 2;
        if (make_test(string(mid, '0'))) {
            l = mid + 1;
            ans = mid;
        } else {
            r = mid - 1;
        }
    }

    if (ans == 0) {
        return string(n, '1');
    }

    string str = string(ans, '0');
    int rep = 0;
    int len = ans;
    while(rep <= len) {
        if (!make_test(str + "1")) {
            rep++;
            str += "0";
        } else {
            rep = 0;
            str += "1";
        }
    }
    str = str.substr(0, (int) str.length()-len-1);

    l = 0, r = n+1;
    int zeros = 0;
    while(l <= r) {
        int mid = (l + r) / 2;
        if (make_test(str + string(mid, '0'))) {
            l = mid + 1;
            zeros = mid;
        } else {
            r = mid - 1;
        }
    }
    str += string(zeros, '0');

    while(1) {
        if (!make_test(str + "0")) break;
        str += "0";
    }
    while((int) str.length() < n) {
        if (make_test("1" + str)) {
            str = "1" + str;
        } else {
            str = "0" + str;
        }
    }

    return str;
}

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: 25 / 25
• Subtask 3: 64 / 64