Compilare: user.cpp: In function ‘int mut1()’: user.cpp:9:10: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:16:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:36:18: warning: unused variable ‘b’ [-Wunused-variable] long long a, b, ca, cb; ^ user.cpp:36:21: warning: unused variable ‘ca’ [-Wunused-variable] long long a, b, ca, cb; ^ user.cpp:36:25: warning: unused variable ‘cb’ [-Wunused-variable] long long a, b, ca, cb; ^ user.cpp:22:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &op, &n, &k); ^ user.cpp:24:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld", &v[i]); ^