#include <stdio.h>
// 1 - 2 +3 -4 +5 -6 +7 -8 +9 -10 의 수식을 구하시오
int main(void){
int sum = 0;
int n = 0;
int i = 0;
while (i < 10)
{
n++;
if(n%2 == 0){
n = -n;
} else{
n = n;
}
sum += n;
i++;
};
};
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