Submission #557987

#	Time	Username	Problem	Language	Result	Execution time	Memory
557987		Ai7081	Martian DNA (IOI16_dna)	C++17	0 / 100	14 ms	404 KiB

dna

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

string analyse(int n, int t) {
    string s;
    int l, r;
    if (!make_test("0")) {
        while (n--) s += "1";
        return s;
    }

    for (int i=0; i<n; i++) s += "0";
    l=1, r=n+1;
    while (l < r) {
        int mid = (l+r)/2;
        if (make_test(s.substr(0, mid))) l = mid+1;
        else r = mid;
    }
    int max0 = l-1;
    s = s.substr(0, max0);

    l=0;
    while (l < max0) {
        if (make_test(s + "1")) s += "1", l=0;
        else s += "0", l++;
    }
    l=1, r=s.size()+1;
    while  (l < r) {
        int mid = (l+r)/2;
        if (make_test(s.substr(0, mid))) l = mid+1;
        else r = mid;
    }
    s = s.substr(0, l-1);

    while (s.size() < n) s = (make_test("1"+s) ? "1" : "0") + s;
    return s;
}

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:36:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |     while (s.size() < n) s = (make_test("1"+s) ? "1" : "0") + s;
      |            ~~~~~~~~~^~~
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