Project Euler: http://projecteuler.net/

ProjectEuler/p009_SpecialPythagoreanTriplet.cpp

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+/* Check cf5-opt.vim defs.
+VIM: let g:lcppflags="-std=c++11 -O2 -pthread"
+VIM: let g:wcppflags="/O2 /EHsc /DWIN32"
+*/
+#include <iostream>
+
+/*
+Special Pythagorean triplet
+Problem 9
+
+A Pythagorean triplet is a set of three natural numbers, a < b < c, for which,
+
+a^2 + b^2 = c^2
+For example, 3^2 + 4^2 = 9 + 16 = 25 = 5^2.
+
+There exists exactly one Pythagorean triplet for which a + b + c = 1000.
+Find the product abc.
+
+Solution:
+
+*/
+
+int main ( void )
+{
+	// a^2+b^2=c^2=(1000-a-b)^2= 1000^2-2000(a+b)+(a+b)^2=
+	// = 1000^2-2000(a+b)+a^2+2ab+b^2 =>
+	// => 0=1000^2-2000(a+b)+2ab =>
+	// => 500000=1000(a+b)-ab
+
+
+	return 0;
+}
+