Nearest Gas Station

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Harry is going to his college by his car on an infinite long straight highway. At some point $X$ he ran out of fuel. But on the highway on which he was riding there are many gas stations. Gas stations are available at points $1, 2, 4, 7, 11, 16, 22…..$ $upto$ $infinite$. Now you have to tell how far is the nearest gas station from his current position i.e from point $X$. $Note:-$ You have to

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solution.cppC++17

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