Created
July 11, 2010 00:57
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| int mine(int n) | |
| { | |
| int i, sum = 0; | |
| for (i = 1; i <= n; i++) { | |
| sum += i^2/4; | |
| } | |
| return sum; | |
| } |
i = 1, r = 0, e = 0
i = 2, r = 1, e = 1
i = 3, r = 3, e = 3
i = 4, r = 7, e = 7
i = 5, r = 13, e = 13
i = 6, r = 22, e = 22
i = 7, r = 34, e = 34
i = 8, r = 50, e = 50
i = 9, r = 70, e = 70
int loop(int n)
{
int i, j, k;
int r = 0;
for (i = 1; i <= n; i++)
for (j = i + 1; j <= n; j++)
for (k = i + j - 1; k <= n; k++)
r++;
return r;
}
/usr/bin/env python
def loop(n):
r = 0
for i in range(1, n+1):
for j in range(i+1, n+1):
for k in range(i+j-1, n+1):
r = r + 1
return r
def correct(n):
sum = 0
for i in range(1, n+1):
sum = sum + i*i/4
return sum
if name == "main":
for i in range(0, 20):
print "i = %2d, loop = %2d, correct = %2d" % (i, loop(i), correct(i))
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rbrito@chagas:/tmp$ ./adriano
i = 1, r = 0, e = 1
i = 2, r = 1, e = 3
i = 3, r = 3, e = 6
i = 4, r = 7, e = 10
i = 5, r = 13, e = 15
i = 6, r = 22, e = 21
i = 7, r = 34, e = 28
i = 8, r = 50, e = 36
i = 9, r = 70, e = 45
rbrito@chagas:/tmp$