Compilare: main.cpp: In function 'int main()': main.cpp:52:9: warning: unused variable 'mx' [-Wunused-variable] int mx=0; ^~ main.cpp:53:9: warning: unused variable 'ans' [-Wunused-variable] int ans=0; ^~~ main.cpp:45:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("hack.in", "r", stdin); ^ main.cpp:46:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("hack.out", "w", stdout); ^