project-euler

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Euler_28.cpp (181B)

      1 #include "Euler.h"
      2 
      3 long Euler::SpiralDiagonals()
      4 {
      5     long sum = 1;
      6 
      7     for (int i = 3; i <= 1001; i += 2)
      8         sum += ((int)(pow(i, 2)) * 4) - (i * 6) + 6;
      9 
     10     return sum;
     11 }