Tunnel or Road

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The Land of Fire has its towns organized in straight line.The towns are numbered $1, 2, 3,..., \text{so on}$ starting from the left. Every town has secret bidirectional tunnels that directly connects this town to the towns which are exactly $M$ towns away from it. Also there are bidirectional roads in each town which connect that town to its immediate left and right towns (*if they exist*). Th

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solution.cppC++17

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