Problem 18
Statement
By starting at the top of the triangle below and moving to adjacent numbers on the row below, the maximum total from top to bottom is 23.
3
7 5
2 4 6
8 5 9 3
That is, 3 + 7 + 4 + 9 = 23.
Find the maximum total from top to bottom of the triangle below:
75
95 64
17 47 82
18 35 87 10
20 04 82 47 65
19 01 23 75 03 34
88 02 77 73 07 63 67
99 65 04 28 06 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 04 68 89 53 67 30 73 16 69 87 40 31
04 62 98 27 23 09 70 98 73 93 38 53 60 04 23
Solution
The code, in C.
#include <stdio.h>
#define SIZE 15
int maxsum(int a[][SIZE], int s){
int i,j;
for(i=s-2;i>=0;i--){
for(j=0;j<=i;j++){
if(a[i+1][j]>a[i+1][j+1])
a[i][j]+=a[i+1][j];
else if(a[i+1][j]<a[i+1][j+1])
a[i][j]+=a[i+1][j+1];
}
}
return a[0][0];
}
int main(void){
int a[15][15]={75, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
95,64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
17,47,82, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
18,35,87,10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
20, 4,82,47,65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
19, 1,23,75, 3,34, 0, 0, 0, 0, 0, 0, 0, 0, 0,
88, 2,77,73, 7,63,67, 0, 0, 0, 0, 0, 0, 0, 0,
99,65, 4,28, 6,16,70,92, 0, 0, 0, 0, 0, 0, 0,
41,41,26,56,83,40,80,70,33, 0, 0, 0, 0, 0, 0,
41,48,72,33,47,32,37,16,94,29, 0, 0, 0, 0, 0,
53,71,44,65,25,43,91,52,97,51,14, 0, 0, 0, 0,
70,11,33,28,77,73,17,78,39,68,17,57, 0, 0, 0,
91,71,52,38,17,14,91,43,58,50,27,29,48, 0, 0,
63,66, 4,68,89,53,67,30,73,16,69,87,40,31, 0,
4,62,98,27,23, 9,70,98,73,93,38,53,60, 4,23};
printf("%d\n",maxsum(a,SIZE));
return 0;
}
Answer
1074
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