Compilare: user.cpp: In function ‘int main()’: user.cpp:32:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:29:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "3secv.in", "r", stdin ); ^ user.cpp:30:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "3secv.out", "w", stdout ); ^ user.cpp: In function ‘void Next()’: user.cpp:84:50: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] std::fread( r, 1, MAXREAD, stdin ), p = 0; ^