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WIP 12781
두 선분의 교차 여부를 확인하는 문제다.
아래 자료를 그대로 재구현해서 백준에 제출하니 80% 정도 넘겨가면서 틀렸다.
참고 자료 : https://gaussian37.github.io/math-algorithm-line_intersection/