Kaneki and Mysterious Item

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The war between CCG and ghouls is raising in Tokyo, Kaneki being king of ghouls is working hard to win this war. Touka has given a very important chest to Kaneki which will increase his ghoul army’s power significantly and might win them the war. But to open the chest Kaneki must solve a puzzle that is engraved on the lock of the chest. Kaneki has $N$ rectangles of width $W$ and height $H$. Kan

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solution.cppC++17

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