Compilare: main.cpp: In function 'bool check(int, int, int)': main.cpp:40:6: warning: unused variable 'i' [-Wunused-variable] {int i,j; ^ main.cpp:40:8: warning: unused variable 'j' [-Wunused-variable] {int i,j; ^ main.cpp: In function 'int main()': main.cpp:68:10: warning: unused variable 'y1' [-Wunused-variable] {int i,j,y1,y2,x1,x2; ^~ main.cpp:68:13: warning: unused variable 'y2' [-Wunused-variable] {int i,j,y1,y2,x1,x2; ^~ main.cpp:68:16: warning: unused variable 'x1' [-Wunused-variable] {int i,j,y1,y2,x1,x2; ^~ main.cpp:68:19: warning: unused variable 'x2' [-Wunused-variable] {int i,j,y1,y2,x1,x2; ^~