Compilare: user.cpp: In function ‘int back2(int)’: user.cpp:174:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘void back1(int, int&)’: user.cpp:127:34: warning: array subscript is above array bounds [-Warray-bounds] for(i=st[k-1][1]+1;i<=st[k][2];i++) ^ user.cpp: In function ‘int back2(int)’: user.cpp:154:34: warning: array subscript is above array bounds [-Warray-bounds] for(i=st[k-1][1]+1;i<=st[k][2];i++) ^ user.cpp: In function ‘int main()’: user.cpp:190:14: warning: array subscript is above array bounds [-Warray-bounds] st[2*n][2]=(1<<n)-1; ^ user.cpp:192:27: warning: array subscript is above array bounds [-Warray-bounds] st[i][2]=st[i+1][2]-1; ^ user.cpp:192:16: warning: array subscript is above array bounds [-Warray-bounds] st[i][2]=st[i+1][2]-1; ^