wenbao与cf010101001010101

小垃圾代码

#include <bits/stdc++.h>
using namespace std;
#define ll  long long 
ll a, b, c, d, x, ax, dx, flag = 0, num = 0;
int main(){
    cin>>a>>b>>c>>d;
    // cout<<num<<endl;
     if( a == 0 && d == 0&&c==0&&b==0 ) { cout <<0 <<endl; return 0; } 
    for( int i = 1; ; i ++ ){
        x = i * ( i - 1 ) / 2;
        // cout<<x<<endl;
        if( x == a ) ax = i, num ++; 
        if( x == d ) dx = i, num ++;
        if( num == 2 ) {flag=1;break; }
        if( x > max( a, d ) ) break;
    }
     // cout<<num<<endl;
    if( ! flag ) cout<<"Impossible"<<endl;
    else{
        if( a == 0 &&c==0&&b==0 ) ax = 0;
        if( d == 0 &&c==0&&b==0) dx = 0;
          // cout << ax << " " << dx << endl;
        if( b + c == ax * dx ){
            num = ax + dx;
        while( num -- ){
                if( b >= dx ) { cout<<0; b -= dx; ax --; }
                else { cout<< 1; dx --; }
            }
        }
        
        else cout <<"Impossible" <<endl;
    }
}

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