Compilare: main.cpp: In function 'void build(int, int)': main.cpp:17:13: warning: unused variable 'u' [-Wunused-variable] 17 | int u, v, nr; | ^ main.cpp:17:16: warning: unused variable 'v' [-Wunused-variable] 17 | int u, v, nr; | ^ main.cpp: In function 'int main()': main.cpp:57:13: warning: unused variable 'i' [-Wunused-variable] 57 | int i, j, nr, n, m, u, v; | ^ main.cpp:57:16: warning: unused variable 'j' [-Wunused-variable] 57 | int i, j, nr, n, m, u, v; | ^ main.cpp:57:19: warning: unused variable 'nr' [-Wunused-variable] 57 | int i, j, nr, n, m, u, v; | ^~