Color Festival

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It is the festival of colors, and you decide to visit your $N$ friends one by one. When you visit friend $i$, your face is painted with color $C_i$. - Initially, your face has **no color**. - If the color currently on your face is different from the color applied by the next friend, your face color **changes**. In particular, when your face has no color and a color is applied to it, your face

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solution.cppC++17

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