Straight lines

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Chef is teaching Sourav Straight lines on Co-ordinate system. Chef gave him $N$ points having $(x$i$,y$i$)$ as co-ordinates (no two points will be identical), and asked him to make straight lines by joining these points, but Chef hates the axes and so he only wants straight lines $neither$ parallel to $X$-$axis$ $nor$ parallel to $Y$-$axis$. Sourav wonders how many straight lines he can make by

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solution.cppC++17

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