Compilare: user.cpp: In function ‘void solve()’: user.cpp:39:18: warning: unused variable ‘j’ [-Wunused-variable] long long i, j, s, x, a, k1; ^ user.cpp:39:21: warning: unused variable ‘s’ [-Wunused-variable] long long i, j, s, x, a, k1; ^ user.cpp:39:24: warning: unused variable ‘x’ [-Wunused-variable] long long i, j, s, x, a, k1; ^ user.cpp: In function ‘void readFile()’: user.cpp:27:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^