Compilare: main.cpp: In function 'void solve1()': main.cpp:34:11: warning: unused variable 'j' [-Wunused-variable] int i,j,x,y,nx,ny; ^ main.cpp: In function 'void solve2()': main.cpp:78:11: warning: unused variable 'j' [-Wunused-variable] int i,j,x,y,x2,y2, nr = 0,k,root; ^ main.cpp:78:31: warning: unused variable 'k' [-Wunused-variable] int i,j,x,y,x2,y2, nr = 0,k,root; ^ main.cpp: In function 'int main()': main.cpp:161:11: warning: unused variable 'j' [-Wunused-variable] int i,j; ^ main.cpp: In function 'void solve2()': main.cpp:157:20: warning: 'firstx' may be used uninitialized in this function [-Wmaybe-uninitialized] g << firstx << " " << firsty; ^~~ main.cpp:157:33: warning: 'firsty' may be used uninitialized in this function [-Wmaybe-uninitialized] g << firstx << " " << firsty; ^ main.cpp:78:33: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized] int i,j,x,y,x2,y2, nr = 0,k,root; ^~~~