Submission #23991

#	Time	Username	Problem	Language	Result	Execution time	Memory
23991		gs14004	Martian DNA (IOI16_dna)	C++11	100 / 100	16 ms	2024 KiB

dna

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

std::string analyse(int n, int t) {
    if(n == 3){
        return "101";
    }
    int s = 0, e = n;
    while(s != e){
        int m = (s+e+1)/2;
        string t;
        for(int j=0; j<m; j++) t.push_back('0');
        if(make_test(t)) s = m;
        else e = m-1;
    }
    string ret;
    for(int j=0; j<s; j++) ret.push_back('0');
    int contfail = 0;
    while(1){
        ret.push_back('1');
        if(make_test(ret)){
            contfail = 0;
            continue;
        }
        else{
            ret.back() = '0';
            contfail++;
            if(contfail > s) break;
        }
    }
    s = 0, e = ret.size();
    while(s != e){
        int m = (s+e+1)/2;
        if(make_test(ret.substr(0, m))) s = m;
        else e = m-1;
    }
    ret = ret.substr(0, s);
    while(ret.size() < n){
        string v1 = "0" + ret;
        string v2 = "1" + ret;
        if(make_test(v1)) ret = v1;
        else ret = v2;
    }
    return ret;
}

Compilation message (stderr)

dna.cpp: In function 'std::__cxx11::string analyse(int, int)':
dna.cpp:39:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(ret.size() < n){
                      ^
grader.cpp: In function 'bool make_test(std::__cxx11::string)':
grader.cpp:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < p.size(); i++) {
                    ^
grader.cpp:23:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 1; i <= ss.size(); i++) {
                    ^
grader.cpp:28:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (pr[i] == p.size()) {
             ^

• Subtask 1: 11 / 11
• Subtask 2: 25 / 25
• Subtask 3: 64 / 64