Submission #1306211

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

int TwoIntegers( const int K, const int S )
{
	if( K < 0 || S < 0 ) return 0;

	if( K >= S )
		return S + 1;
	if( 2 * K >= S )
		return 2 * K - S + 1;
	else
		return 0;
}

int ThreeIntegers( const int K, const int S )
{
int i;
int iSum;
int iMin;
int iMax;

	if( K < 0 || S < 0 ) return 0;

	if( K > S )
		iMax = S;
	else
		iMax = K;

	if( 2 * K < S )
		iMin = S - 2 * K;
	else
		iMin = 0;

	iSum = 0;
	for( i = iMin; i <= iMax; i++ )
		iSum += TwoIntegers( K, S - i );

	return iSum;
}

int main( int argc, char *argv[] )
{
int K;
int S;

	ios::sync_with_stdio( false );
	cin.tie( 0 );

	cin >> K;
	cin >> S;
	cout << ThreeIntegers( K, S ) << endl;

	return 0;
}

Submission Info

Judge Result