Compilare: user.cpp: In function ‘void rec(int, int)’: user.cpp:11: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:16: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:21: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:26: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp: In function ‘int main()’: user.cpp:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result