Compilare: user.cpp: In function ‘void filling(int, int)’: user.cpp:64:14: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] if (l<1|l>n||c<1||c>m) ^ user.cpp: In function ‘void fillingcoloured(int, int)’: user.cpp:105:14: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] if (l<1|l>n||c<1||c>m) ^ user.cpp: In function ‘int solvecolour(int)’: user.cpp:129:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (a=0;a<p[c].size();a++) { ^ user.cpp: In member function ‘void instream::advance()’: user.cpp:44:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^ user.cpp: In constructor ‘instream::instream(const char*)’: user.cpp:18:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^