Submission #406481

#	Time	Username	Problem	Language	Result	Execution time	Memory
406481		Alma	Martian DNA (IOI16_dna)	C++17	0 / 100	17 ms	400 KiB

dna

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

string analyse(int n, int t) {
    string z = "", o = "", s;
    for (int i = 0; i < n; i++) {
        z += '0'; o += '1';
    }
    if (!make_test("0")) return o;
    if (!make_test("1")) return z;

    int lo = 0, mid, res = 0, hi = n;
    while (lo <= hi) {
        mid = (lo+hi) / 2;
        s = z.substr(0, mid);
        if (make_test(s)) {
            res = mid;
            lo = mid+1;
        } else {
            hi = mid-1;
        }
    }

    int l = 0, r = 0;
    string p = "";
    while ((int)p.size() < n) {
        if (r < res && make_test(p + '0')) {
            p += '0'; r++;
        } else {
            p += '1'; r = 0;
        }
        if (l < res && make_test('0' + p)) {
            p = '0' + p; l++;
        } else {
            p = '1' + p; l = 0;
        }

        if (!make_test(p)) {
            int m = (int)p.size();
            if (make_test(p.substr(1, m-1))) {
                p = p.substr(1, m-1);
                while (true) {
                    if ((int)p.size() == n) return p;
                    if (r < res && make_test(p + '0')) {
                        p += '0'; r++;
                    } else {
                        p += '1'; r = 0;
                    }
                }
            } else {
                p = p.substr(0, m-1);
                while (true) {
                    if ((int)p.size() == n) return p;
                    if (l < res && make_test('0' + p)) {
                        p = '0' + p; l++;
                    } else {
                        p = '1' + p; l = 0;
                    }
                }
            }
        }
    } return p;
} 

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