Compilare: user.cpp: In function ‘void copy(long long unsigned int (*)[42], long long unsigned int (*)[42])’: user.cpp:10: warning: comparison between signed and unsigned integer expressions user.cpp:11: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void mul(long long unsigned int (*)[42], long long unsigned int (*)[42], long long unsigned int (*)[42])’: user.cpp:16: warning: comparison between signed and unsigned integer expressions user.cpp:17: warning: comparison between signed and unsigned integer expressions user.cpp:19: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:27: warning: comparison between signed and unsigned integer expressions user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp:32: warning: format ‘%ld’ expects type ‘long int’, but argument 2 has type ‘long long unsigned int’ user.cpp:39: warning: comparison between signed and unsigned integer expressions user.cpp:40: warning: comparison between signed and unsigned integer expressions user.cpp:42: warning: format ‘%ld’ expects type ‘long int’, but argument 2 has type ‘long long unsigned int’ user.cpp:23: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:24: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result