Submission #990468

#	Time	Username	Problem	Language	Result	Execution time	Memory
990468		aaaaaarroz	Martian DNA (IOI16_dna)	C++17	100 / 100	6 ms	604 KiB

dna

    #include <bits/stdc++.h>
    #include "dna.h"
    using namespace std;
     
    string analyse(int n, int t) {
    	string ans = "";
    	int lo = 0, hi = n;
    	while (lo < hi) {
    		int mid = (lo + hi + 1) >> 1;
    		string cur = "";
    		for (int i = 0; i < mid; ++i) cur += '0';
    		if (make_test(cur)) lo = mid;
    		else hi = mid - 1;
    	}
    	for (int i = 0; i < lo; ++i) ans += '0';
    	int cnt = 0;
    	while (ans.size() < n && cnt <= lo) {
    		if (make_test(ans + "1")) {
    			ans += "1";
    			cnt = 0;
    		} else {
    			ans += "0";
    			++cnt;
    		}
    	}
    	for (int i = 0; i < cnt; ++i) ans.pop_back();
    	while (make_test(ans + "0")) ans += '0';
    	if (ans.size() < n) ans = "1" + ans;
    	while (ans.size() < n) {
    		if (make_test("1" + ans)) ans = "1" + ans;
    		else ans = "0" + ans;
    	}
    	return ans;
    }

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:17:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   17 |      while (ans.size() < n && cnt <= lo) {
      |             ~~~~~~~~~~~^~~
dna.cpp:28:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   28 |      if (ans.size() < n) ans = "1" + ans;
      |          ~~~~~~~~~~~^~~
dna.cpp:29:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |      while (ans.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