Compilare: main.cpp: In function 'int main()': main.cpp:13:18: warning: unused variable 'j' [-Wunused-variable] int n, m, i, j, k, x, ok; ^ main.cpp:13:21: warning: unused variable 'k' [-Wunused-variable] int n, m, i, j, k, x, ok; ^ main.cpp:13:24: warning: unused variable 'x' [-Wunused-variable] int n, m, i, j, k, x, ok; ^ main.cpp:13:27: warning: unused variable 'ok' [-Wunused-variable] int n, m, i, j, k, x, ok; ^~