Submission #1036759

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036759		MarwenElarbi	Colors (BOI20_colors)	C++17	0 / 100	0 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;
    //setIO("closing");
    int n;
    cin>>n;
    cout << "? "<<n/2-1<<endl;
    int nothing;cin>>nothing;
    int l=0;
    int r=n-1;
    int lst=n/2-1;
    int i=lst;
    int j=lst;
    int end=1;
    bool vis[n+1];
    memset(vis,0,sizeof vis);
    vis[(int)__lg(n)]=true;
    while(r-l>1){
        int mid=(r+l)/2;
        if(lst+mid<=n&&!vis[lst+mid]){
            cout <<"? "<<lst+mid<<endl;
            vis[lst+mid]=true;
            lst=lst+mid;
        }else{
            cout <<"? "<<lst-mid<<endl;
            vis[lst-mid]=true;
            lst=lst-mid;
        }
        int c;
        cin>>c;
        if(c==0){
            l=mid;
        }else{
            r=mid;
        }
    }
    cout <<"= "<<r<<endl;
} 

Compilation message (stderr)

Colors.cpp: In function 'int main()':
Colors.cpp:45:9: warning: unused variable 'i' [-Wunused-variable]
   45 |     int i=lst;
      |         ^
Colors.cpp:46:9: warning: unused variable 'j' [-Wunused-variable]
   46 |     int j=lst;
      |         ^
Colors.cpp:47:9: warning: unused variable 'end' [-Wunused-variable]
   47 |     int end=1;
      |         ^~~
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);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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