11758번 CCW

http://hsdevelopment.tistory.com/123

#include <iostream>
#include <queue>
#include <stack>
#include <cstdio>
#include <vector>
#include <cstring>
#include <string>
#include <math.h>
#include <algorithm>
#include <map>
 
using namespace std;
 
int ccw(int x1, int y1, int x2, int y2, int x3, int y3) 
{
    int temp = x1*y2 + x2*y3 + x3*y1;
 
    temp = temp - y1*x2 - y2*x3 - y3*x1;
 
    if (temp > 0) return 1; // 반시계
    else if (temp < 0) return -1; // 시계
    else return 0;    // 일직선
}
 
int main(void)
{
    int x1 = 0, y1 = 0, x2 = 0, y2 = 0, x3 = 0, y3 = 0;
 
    scanf("%d %d %d %d %d %d", &x1, &y1, &x2, &y2, &x3, &y3);
 
    printf("%d\n", ccw(x1, y1, x2, y2, x3, y3));
 
    return 0;
}