Compilare: main.cpp: In function 'int main()': main.cpp:80:26: warning: left operand of comma operator has no effect [-Wunused-value] l1 , l2; ^~ main.cpp:80:28: warning: right operand of comma operator has no effect [-Wunused-value] l1 , l2; ^ main.cpp: In function 'void nxt()': main.cpp:33:38: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buff , N * 10 , 1 , stdin); ^ main.cpp: In function 'int main()': main.cpp:52:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("aparate.in" , "r" , stdin); ^ main.cpp:53:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("aparate.out" , "w" , stdout); ^