Compilare: main.cpp: In function 'int main()': main.cpp:16:15: warning: unused variable 'nr' [-Wunused-variable] 16 | int i, j, nr, n, m,is,js,ie,je,ie1,je1,ie2,je2,res=0; | ^~ main.cpp:16:24: warning: variable 'is' set but not used [-Wunused-but-set-variable] 16 | int i, j, nr, n, m,is,js,ie,je,ie1,je1,ie2,je2,res=0; | ^~