pe18 in-place

#include <stdio.h>
#include <string.h>

int tri[15][15] =
{
  {75},
  {95,64},
  {17,47,82},
  {18,35,87,10},
  {20, 4,82,47,65},
  {19, 1,23,75, 3,34},
  {88, 2,77,73, 7,63,67},
  {99,65, 4,28, 6,16,70,92},
  {41,41,26,56,83,40,80,70,33},
  {41,48,72,33,47,32,37,16,94,29},
  {53,71,44,65,25,43,91,52,97,51,14},
  {70,11,33,28,77,73,17,78,39,68,17,57},
  {91,71,52,38,17,14,91,43,58,50,27,29,48},
  {63,66, 4,68,89,53,67,30,73,16,69,87,40,31},
  { 4,62,98,27,23, 9,70,98,73,93,38,53,60, 4,23}
};

int main()
{
  int i, j;

  for (i=13; i>=0; i--)
    for (j=0; j<=i; j++)
      tri[i][j] += (tri[i+1][j] > tri[i+1][j+1] ? tri[i+1][j] : tri[i+1][j+1]);

  printf("%d\n",**tri);
  return 0;
}