Submission #512853

#	Time	Username	Problem	Language	Result	Execution time	Memory
512853		Carmel_Ab1	Hidden Sequence (info1cup18_hidden)	C++17	34 / 100	8 ms	408 KiB

hidden

#include<bits/stdc++.h>
#include "grader.h"
#define pb push_back
using namespace std;
typedef vector<int>vi;

bool ask(vi v){return isSubsequence(v);}
int c0=0,c1=0;


vi buildL(int n){
    int cur1=c1,cur0=c0;
    vi ans;

    while(ans.size()!=n){
        if(cur1>cur0){

            vi v;
            for(int x:ans)
                v.pb(x);
            v.pb(1);
            for(int i=0; i<cur0; i++)
                v.pb(0);
            if(ask(v))
                ans.pb(1),cur1--;
            else
                ans.pb(0),cur0--;
        }
        else{
            vi v;
            for(int x:ans)
                v.pb(x);
            v.pb(0);
            for(int i=0; i<cur1; i++)
                v.pb(1);
            if(ask(v))
                ans.pb(0),cur0--;
            else
                ans.pb(1),cur1--;
        }
    }
    return ans;
}
vi buildR(int n){
    int cur1=c1,cur0=c0;
    vi ans;

    while(ans.size()!=n){
        if(cur1>cur0){
            vi v=vi(cur0,0);
            v.pb(1);
            for(int x:ans)
                v.pb(x);
            if(ask(v))
                ans.insert(ans.begin(),1),cur1--;
            else
                ans.insert(ans.begin(),0),cur0--;
        }
        else{
            vi v=vi(cur1,1);
            v.pb(0);
            for(int x:ans)
                v.pb(x);
            if(ask(v))
                ans.insert(ans.begin(),0),cur0--;
            else
                ans.insert(ans.begin(),1),cur1--;
        }
    }
    return ans;
}
vi findSequence (int n){
    for(int i=1; ; i++){
        vi all1=vi(i,1);
        vi all0=vi(i,0);

        if(!ask(all1)){
            c1=i-1;
            c0=n-c1;
            break;
        }
        if(!ask(all0)){
            c0=i-1;
            c1=n-c1;
            break;
        }
    }
    vi L=buildL((n+1)/2),R=buildR(n/2);
    vi ans;
    for(int x:L)ans.pb(x);
    for(int x:R)ans.pb(x);
    return ans;
}

Compilation message (stderr)

hidden.cpp: In function 'vi buildL(int)':
hidden.cpp:15:21: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   15 |     while(ans.size()!=n){
      |           ~~~~~~~~~~^~~
hidden.cpp: In function 'vi buildR(int)':
hidden.cpp:48:21: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   48 |     while(ans.size()!=n){
      |           ~~~~~~~~~~^~~
grader.cpp: In function 'int main()':
grader.cpp:28:26: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wformat=]
   28 |     fprintf (fifo_out, "%d\n", ans.size ());
      |                         ~^     ~~~~~~~~~~~
      |                          |              |
      |                          int            std::vector<int>::size_type {aka long unsigned int}
      |                         %ld
grader.cpp:29:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for (int i=0; i<ans.size () && i < N; i++)
      |                   ~^~~~~~~~~~~~

• Subtask 1: 10 / 20
• Subtask 2: 24 / 80