Submission #625364

#	Time	Username	Problem	Language	Result	Execution time	Memory
625364		Stavab	Aliens (IOI07_aliens)	C++14	Compilation error	0 ms	0 KiB

aliens

#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, x0, y0;
    cin >> n >> x0 >> y0;
    
    
    int t = 1;
    while(1)
    {
        if(x0 - t > 0)
            cout << "examine " << x0 - t << " " << y0;
        else
            break;
        
        string s;
        cin >> s;
        
        if(s == "true")
            t *= 2;
        else
            break;
    }
    int low = max(x0 - t, 0);
    int high = x0;
    while(high - low > 2)
    {
        int middle = (low + high) / 2;
        
        cout << "examine " << middle << " " << y0;
        
        string s;
        cin >> s;
        
        if(s == "true")
            high = middle;
        else
            low = middle;
    }
    int xL = high;
    
    t = 1;
    while(1)
    {
        if(x0 + t <= n)
            cout << "examine " << x0 + t << " " << y0;
        else
            break;
        
        string s;
        cin >> s;
        
        if(s == "true")
            t *= 2;
        else
            break;
    }
    int low = x0;
    int high = min(x0 + t, n + 1);
    while(high - low > 2)
    {
        int middle = (low + high) / 2;
        
        cout << "examine " << middle << " " << y0 << endl;
        
        string s;
        cin >> s;
        
        if(s == "true")
            low = middle;
        else
            high = middle;
    }
    int xR = low;

    int m = xR - xL + 1;

    t = 1;
    while(1)
    {
        if(y0 + t <= n)
            cout << "examine " << x0 << " " << y0 + t << endl;
        else
            break;
        
        string s;
        cin >> s;
        
        if(s == "true")
            t *= 2;
        else
            break;
    }
    int low = y0;
    int high = min(y0 + t, n + 1);
    while(high - low > 2)
    {
        int middle = (low + high) / 2;
        
        cout << "examine " << x0 << " " << middle << endl;
        
        string s;
        cin >> s;
        
        if(s == "true")
            low = middle;
        else
            high = middle;
    }
    int yU = low;
    
    int yD = yU - m + 1;
    
    int middleX = (xR + xL) / 2;
    int middleY = (yU + yD) / 2;
    
    int cornerX = middleX;
    string s;
    while(1)
    {
        if(cornerX + 2*m < n)
            cout << "examine " << cornerX + 2*m << " " << middleY << endl;
        else
            break;
            
        cin >> s;
        if(s == "true")
            cornerX += 2*m;
        else
            break;
    }
    int cornerY = middleY;
    while(1)
    {
        if(cornerY + 2*m < n)
            cout << "examine " << middleX << " " << cornerY + 2*m << endl;
        else
            break;
            
        cin >> s;
        if(s == "true")
            cornerY += 2*m;
        else
            break;
    }
    
    cout << "solution " << cornerX - 2*m - m/2 << " " << cornerY - 2*m - m/2 << endl;
    
    return 0;
}

Compilation message (stderr)

aliens.cpp: In function 'int main()':
aliens.cpp:64:9: error: redeclaration of 'int low'
   64 |     int low = x0;
      |         ^~~
aliens.cpp:30:9: note: 'int low' previously declared here
   30 |     int low = max(x0 - t, 0);
      |         ^~~
aliens.cpp:65:9: error: redeclaration of 'int high'
   65 |     int high = min(x0 + t, n + 1);
      |         ^~~~
aliens.cpp:31:9: note: 'int high' previously declared here
   31 |     int high = x0;
      |         ^~~~
aliens.cpp:100:9: error: redeclaration of 'int low'
  100 |     int low = y0;
      |         ^~~
aliens.cpp:30:9: note: 'int low' previously declared here
   30 |     int low = max(x0 - t, 0);
      |         ^~~
aliens.cpp:101:9: error: redeclaration of 'int high'
  101 |     int high = min(y0 + t, n + 1);
      |         ^~~~
aliens.cpp:31:9: note: 'int high' previously declared here
   31 |     int high = x0;
      |         ^~~~