Compilare: user.cpp: In function ‘long long int solve(int, int)’: user.cpp:12: warning: zero-length gnu_printf format string user.cpp: In function ‘int main()’: user.cpp:63: warning: format ‘%s’ expects type ‘char*’, but argument 2 has type ‘char (*)[300]’ user.cpp:55: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:56: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:62: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:63: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘long long int solve(int, int)’: user.cpp:30: warning: ‘k’ may be used uninitialized in this function