Submission #1036473

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036473		MarwenElarbi	Colors (BOI20_colors)	C++17	0 / 100	2 ms	344 KiB

Colors

#include <bits/stdc++.h>
#define vi vector<int>
#define ve vector
#define ll long long
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define onbit __builtin_popcount
#define ii pair<int,int>
#define vvi vector<vi>
#define vii vector<ii>
#define gii greater<ii>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF 1e18
#define eps 1e-7
#define eps1 1e-2
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define MAX_A 1e5+5
using namespace std;
const int MOD = 1e9+7;
const int nax = 2e5+5;
const int MAX_VAL = 1e6;
double PI=3.14159265359;
int arx[8]={1,1,0,-1,-1,-1, 0, 1};
int ary[8]={0,1,1, 1, 0,-1,-1,-1};
typedef complex<int> Point;
#define X real()
#define Y imag()
void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}
int main(){
    optimise;
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
    //setIO("closing");
    int n;
    cin>>n;
    cout << "? "<<__lg(n)<<endl;
    int nothing;cin>>nothing;
    int l=0;
    int r=n-1;
    int lst=__lg(n);
    int i=lst;
    int j=lst;
    while(r-l>1){
        int mid=(r+l)/2;
        cout <<"? "<<lst+mid<<endl;
        int c;
        cin>>c;
        if(c==0){
            j--;
            lst=j;
            l=mid;
            if(l==r-1) break;
            cout<<"? "<<lst<<endl;
            cin>>c;
            if(c==1){
                r=mid+1;
                break;
            }
        }else{
            i++;
            lst=i;
            r=mid;
            if(r==l+1) break;
            cout<<"? "<<lst<<endl;
            cin>>c;
            r=mid-(c ? 1 : 0);
        }
    }
    cout <<"= "<<r<<endl;
}   

Compilation message (stderr)

Colors.cpp: In function 'void setIO(std::string)':
Colors.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Colors.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Colors.cpp: In function 'int main()':
Colors.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Colors.cpp:39:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 33