// question 1 (You have given a series, 1+2+3-4-5-6+7+8+9-10-11-12+......N . Your task to print the sum of the Nth element.)
#include <stdio.h>
void num(int a);
int main()
{
int y;
num(y);
return 0;
}
void num(int a)
{
int i, sum1 = 0, calc = 0;
for (i = 1; i <= a; i++)
{
if (calc % 2 == 0)
sum1 += i;
else
sum1 -= i;
if (i % 3 == 0)
calc++;
}
}
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