Compilare: user.cpp: In function ‘void read()’: user.cpp:44:5: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(s[0] == 'M') ^ user.cpp: In function ‘int main()’: user.cpp:208:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zeap.in", "r", stdin); ^ user.cpp:209:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zeap.out", "w", stdout); ^