Compilare: main.cpp: In function 'int main()': main.cpp:56:21: warning: unused variable 'i1' [-Wunused-variable] 56 | int i1, j1, i2, j2; | ^~ main.cpp:56:25: warning: unused variable 'j1' [-Wunused-variable] 56 | int i1, j1, i2, j2; | ^~ main.cpp:56:29: warning: unused variable 'i2' [-Wunused-variable] 56 | int i1, j1, i2, j2; | ^~ main.cpp:56:33: warning: unused variable 'j2' [-Wunused-variable] 56 | int i1, j1, i2, j2; | ^~