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c++ string c c++ questions strncmp strcpy strcmp polymorphism pointers stack stl priority_queue storage class specifiers queue container adapters operator overloading inheritance algorithm storage class specifer trees runtime polymorphism function overloading operator new reference variables c++11 range based for loop dma access specifiers constructor static storage class specifier extern nm const strchr strstr binary search arrays strncpy linear search factorial c function prime gcd and lcm memory leakage