Submission #2549270

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Source Code Expand

function Main(s){
	s=s.split(/\n|\s/);
	s.forEach(function(e,i,a){a[i]=Math.abs(Number(a[i]));});
	
	if((s[2]%s[1]==0)&&(s[3]%s[1]==0)){
		s[2]/=s[1];s[3]/=s[1];s[1]=1;
		
		var n=s[0];
		var cb2=[[1]];
		for(var i=1;i<=n;i=(i+1)|0){
			cb2[i]=[];
			for(var j=0;j<=i;j=(j+1)|0){
				cb2[i][j]=((isNaN(cb2[i-1][j])?0:cb2[i-1][j])+(isNaN(cb2[i-1][j-1])?0:cb2[i-1][j-1]))/2;
			}
		}
		
		var ans=0;
		for(var i=0;i<=n;i=(i+1)|0){
			var o1,o2;
			if(((i+s[2])/2)==((i+s[2])/2|0)&&(((n-i)+s[3])/2)==(((n-i)+s[3])/2|0)){
				o1=(i+s[2])/2;
				o2=((n-i)+s[3])/2;
				if(i>=o1&&n-i>=o2){
					ans+=cb2[n][i]*cb2[i][o1]*cb2[n-i][o2];
				}
			}
		}
		console.log(ans);
	}
	else{console.log(0);}
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));

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