Compilare: user.cpp: In function ‘int main()’: user.cpp:65:9: warning: variable ‘n’ set but not used [-Wunused-but-set-variable] int n,m,i,type,i1,i2; ^ user.cpp:64:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("disjoint.out","w",stdout); ^ user.cpp: In function ‘char getChar(FILE*)’: user.cpp:14:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, BUF_SIZE, f); ^