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Cod sursa(job #379414)
/*
* File: main.cpp
* Author: virtualdemon
*
* Created on January 1, 2010, 5:35 PM
*/
#include <vector>
#include <fstream>
#include <iterator>
#include <algorithm>
#define pb push_back
/*
*
*/
using namespace std;
struct vertex
{
int s, a, b, c;
}x;
inline ostream& operator<<( ostream& out, vertex x )
{
out<<x.a<<' '<<x.b<<' '<<x.c;
return out;
}
vector< int > coin;
vector< vertex > v;
int main()
{int n, S, i, j, k, left, right, middle, key;
ifstream in("loto.in");
in>>n>>S;
copy( istream_iterator<int>(in), istream_iterator<int>(), back_inserter(coin) );
sort( coin.begin(), coin.end() ); //sort
for( i=0; i < n; ++i ) //generate all the sums
for( j=0; j < n; ++j )
for( k=0; k < n; ++k )
{
x.s=coin[i]+coin[j]+coin[k];
x.a=coin[i]; x.b=coin[j]; x.c=coin[k];
if( S == 2*x.s ) //we have found a result
{
ofstream out("loto.out");
out<<x<<' '<<x;
return 0;
}
if( x.s < S )
v.pb(x);
}
if( v.empty() )
{
ofstream out("loto.out");
out<<"-1";
return 0;
}
for( i=0, n=v.size(); i < n; ++i )
{
key=v[i].s;
left=0;
right=n-1;
while( left < right )
{
middle=left+(right-left)/2;
if( S == key+v[middle].s )
{
ofstream out("loto.out");
out<<v[i]<<' '<<v[middle];
return 0;
}
if( S < key+v[middle].s )
right=middle;
else left=middle+1;
}
}
ofstream out("loto.out");
out<<"-1";
return 0;
}