int main(int argc, char* argv[]) {
uint64_t m,n,s,d,l,x,y,z;
uint32_t a=1,b,c,i,j;
x=y=z=0-1;
if(argc > 1 && !strcmp(argv[1],"--help")) { return print_help(argv[0]); }
for(i=5,l=0; a; ++i,l=m) {
m = getPent(i);
if(m-l > z) /* break when minimum found */
break;
for(j=i-1; j>0; --j) {
n = getPent(j);
s = m + n;
d = m - n;
b = isPent(s);
c = isPent(d);
if(b && c) {
a = 0;
x = m;
y = n;
z = d; /* difference to be minimized */
}
}
}
/* print result */
printf("%llu - %llu = %llu\n",x,y,z);
return 0;
}
int main ()
{
long curNum = 1;
std::vector<long> pentList;
std::vector<bool> isPent(MAX, false);
for(int i = 1; curNum < MAX ; i += 3, curNum += i)
{
//Create list of pentagonal numbers
pentList.push_back(curNum);
//Create look up table of pentagonal numbers
isPent[curNum] = true;
}
int endLoop = pentList.size();
for(int i = 0; i < endLoop; ++i)
{
for(int j = i; j < endLoop; ++j)
{
//This condition prevents segfaulting even though it shouldn't be needed
//Reason: Unknown
if(pentList[i] + pentList[j] > MAX ||
pentList[j] - pentList[i] < 0)
{
break;
}
else if(isPent[pentList[i] + pentList[j]] &&
isPent[pentList[j] - pentList[i]])
{
std::cout << pentList[i] << " " << pentList[j] << " " << pentList[j] - pentList[i] << std::endl;
}
else {}
}
}
return 0;
}
