Compilare: user.cpp: In function ‘int main()’: user.cpp:29:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("saracsaurege.in","r",stdin); ^ user.cpp:30:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("saracsaurege.out","w",stdout); ^ user.cpp: In function ‘int getInt()’: user.cpp:20:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (++ptr>=maxb) fread(buf,maxb,1,stdin),ptr=0; ^ user.cpp:23:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (++ptr>=maxb) fread(buf,maxb,1,stdin),ptr=0; ^ user.cpp: In function ‘int main()’: user.cpp:44:21: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] int x,y,diff,sh,k,t; ^ user.cpp:50:9: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (l != lg[y - x + 1]) { ^