Compilare: user.cpp: In function ‘void solve()’: user.cpp:80:15: warning: unused variable ‘sign’ [-Wunused-variable] long long sign = 1, prod = 1; ^ user.cpp:80:25: warning: unused variable ‘prod’ [-Wunused-variable] long long sign = 1, prod = 1; ^ user.cpp: In function ‘void readFile()’: user.cpp:113:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t); ^ user.cpp:118:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld%lld", &a, &b); ^