Submission #562977

#	Time	Username	Problem	Language	Result	Execution time	Memory
562977		Spade1	Martian DNA (IOI16_dna)	C++14	100 / 100	11 ms	468 KiB

dna

#include<bits/stdc++.h>
#include "dna.h"
#define pii pair<int, int>
#define pll pair<long long, long long>
#define ll long long
#define ld long double
#define st first
#define nd second
#define pb push_back
#define INF INT_MAX
using namespace std;

string analyse(int n, int t) {
    int l = 0, r = n;
    while (l < r) {
        int mid = (l+r+1)/2;
        string test;
        for (int i = 1; i <= mid; ++i) test += "1";
        if (make_test(test)) l = mid;
        else r = mid-1;
    }

    int _max = l;

    string s;
    for (int i = 1; i <= _max; ++i) s += "1";
    int cnt = _max;
    while (cnt <= _max) {
        if (make_test(s + "0")) {
            s += "0";
            cnt = 0;
        }
        else {
            s += "1";
            cnt++;
        }
    }

    while (!s.empty() && s.back() == '1') {
        s.erase(s.end()-1);
    }

    l = 0, r = _max;
    while (l < r) {
        int mid = (l+r+1)/2;
        string test = s;
        for (int i = 1; i <= mid; ++i) test += "1";
        if (make_test(test)) l = mid;
        else r = mid-1;
    }

    for (int i = 1; i <= l; ++i) s += "1";

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

    return s;
}

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:54:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   54 |     while (s.size() < n) {
      |            ~~~~~~~~~^~~
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