Compilare: main.cpp: In function 'int main()': main.cpp:33:25: warning: unused variable 'i' [-Wunused-variable] int n , m , a , b , i; ^ main.cpp:34:15: warning: unused variable 'sola' [-Wunused-variable] long long sola , solb , suma , aux; ^~~~ main.cpp:34:22: warning: unused variable 'solb' [-Wunused-variable] long long sola , solb , suma , aux; ^~~~ main.cpp:34:29: warning: unused variable 'suma' [-Wunused-variable] long long sola , solb , suma , aux; ^~~~ main.cpp:34:36: warning: unused variable 'aux' [-Wunused-variable] long long sola , solb , suma , aux; ^~~ main.cpp:35:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d",&n,&m,&a,&b); ^