Compilare: user.cpp: In function ‘int main()’: user.cpp:20:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<strlen(b);j++){ ^ user.cpp:13:33: warning: unused variable ‘c’ [-Wunused-variable] int a[100][100],d[100][100],c[4],i,j,n,m,xx,yy,x1,x2,y1,y2,cx,cy; ^ user.cpp:135:29: warning: ‘cy’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<min<<" "<<cx<<" "<<cy; ^ user.cpp:135:18: warning: ‘cx’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<min<<" "<<cx<<" "<<cy; ^