Submission #820859

#	Time	Username	Problem	Language	Result	Execution time	Memory
820859		vjudge1	The Big Prize (IOI17_prize)	C++14	Compilation error	0 ms	0 KiB

prize

#include<bits/stdc++.h>
//#include "prize.h"
using namespace std ;
int cnt ;
vector<int> ask(int ind)
{
    cnt++ ;
    vector<int> v(2) ;
    cout << "? " << ind << '\n' ;
    cin >> v[0] >> v[1] ;
    return v ;
}
int find_best(int n)
{
    bool flag = 0 ;
    int l = -1, r = n ;
    while(l + 1 < r)
    {
        int mid = (l + r) / 2 ;
        vector<int> v = ask(mid) ;
        if(v[0] && v[1])
        {
            flag = 1 ;
            break ;
        }
        if(!v[0] && !v[1])
            return mid ;
        else
        {
            if(v[0])
                r = mid ;
            else
                l = mid ;
        }
    }
    if(!flag)
        return l ;
    int ind = 0 ;
    while(ind < n)
    {
        vector<int> abu = ask(ind) ;
        if(cnt == 10000)
        {
            while(true)
            {
            }
        }
        if(!abu[0] && !abu[1])
            return ind ;
        int l = ind, r = n ;
        while(l + 1 < r)
        {
            int mid = (l + r) >> 1 ;
            vector<int> now = ask(mid) ;
            if(cnt == 10000)
            {
                while(true)
                {
                }
            }
            cnt++ ;
            if(!now[0] && !now[1])
                return mid ;
            else
            {
                if(now[0] == abu[0] && now[1] == abu[1])
                    l = mid ;
                else
                    r = mid ;
            }
        }
        ind = l + 1 ;
    }
}
signed main()
{
    int n ;
    cin >> n ;
    cout<<find_best(n) ;
    return 0 ;
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:74:1: warning: control reaches end of non-void function [-Wreturn-type]
   74 | }
      | ^
/usr/bin/ld: /tmp/ccl9ID1Q.o: in function `ask(int)':
grader.cpp:(.text+0x80): multiple definition of `ask(int)'; /tmp/ccMnTn4R.o:prize.cpp:(.text+0x0): first defined here
/usr/bin/ld: /tmp/ccl9ID1Q.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccMnTn4R.o:prize.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status