Compilare: user.cpp: In function ‘void read(int&)’: user.cpp:14:21: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] while(buffer[p] < 48 | buffer[p] > 57) ^ user.cpp:18:21: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while(buffer[p] > 47 & buffer[p] < 58) ^ user.cpp: In function ‘int main()’: user.cpp:28:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("exp.in", "r", stdin); ^ user.cpp:29:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("exp.out", "w", stdout); ^ user.cpp: In function ‘void read(int&)’: user.cpp:16:65: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++p == 500000) fread(buffer, 1, 500000, stdin), p = 0; ^ user.cpp:22:65: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++p == 500000) fread(buffer, 1, 500000, stdin), p = 0; ^