Compilare: main.cpp: In member function 'void presuff::reset(std::__cxx11::string)': main.cpp:76:21: warning: unused variable 'n' [-Wunused-variable] int n=s.size(); ^ main.cpp: In function 'int main()': main.cpp:97:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("carte.in","r",stdin); ^ main.cpp:98:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("carte.out","w",stdout); ^