Compilare: user.cpp: In function ‘void read()’: user.cpp:41: warning: format ‘%d’ expects type ‘int*’, but argument 2 has type ‘char*’ user.cpp:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void dp()’: user.cpp:47: warning: unused variable ‘cam’ user.cpp: In function ‘int main()’: user.cpp:88: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result