Compilare: user.cpp: In function ‘void pre_df(int)’: user.cpp:47:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<a[x].size();i++) ^ user.cpp: In function ‘void elimina(int)’: user.cpp:69:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<a[x].size();i++) ^ user.cpp: In function ‘void descompun(int, int, int)’: user.cpp:98:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<a[x].size();i++) ^ user.cpp: In function ‘bool query(int, int)’: user.cpp:128:22: warning: unused variable ‘j’ [-Wunused-variable] int x,suprem,i,y,j; ^ user.cpp: In function ‘void read()’: user.cpp:31:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:35:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&x,&y); ^ user.cpp: In function ‘int main()’: user.cpp:190:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&type,&x,&y); ^ user.cpp: In function ‘bool query(int, int)’: user.cpp:156:5: warning: ‘suprem’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (i=from[b],y=msk[b];i != suprem; i=t[i]) ^ user.cpp: In function ‘void elimina(int)’: user.cpp:58:14: warning: ‘mxi’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i,mx,mxi; ^