Compilare: main.cpp: In function 'int main()': main.cpp:44:21: warning: unused variable 'cnt' [-Wunused-variable] ll ans = 0, mm, d, cnt; ^~~ main.cpp:37:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("light2.in","r",stdin); ^ main.cpp:38:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("light2.out","w",stdout); ^