Compilare: user.cpp: In function ‘void calcul(int, int)’: user.cpp:23:24: warning: unused variable ‘j’ [-Wunused-variable] int mn=100000,ii,i,j; ^ user.cpp: In function ‘int main()’: user.cpp:41:27: 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:46:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(j=1;j<=m;j++) fscanf(f,"%d",&a[i][j]); ^ user.cpp: In function ‘void calcul(int, int)’: user.cpp:31:27: warning: ‘ii’ may be used uninitialized in this function [-Wmaybe-uninitialized] calcul(x+dx[ii],y+dy[ii]); ^