Compilare: main.cpp: In function 'int main()': main.cpp:36:30: warning: unused variable 'a' [-Wunused-variable] 36 | {int n, m, x, y, val, i, op, a, b; | ^ main.cpp:36:33: warning: unused variable 'b' [-Wunused-variable] 36 | {int n, m, x, y, val, i, op, a, b; | ^