Compilare: main.cpp: In function 'int main()': main.cpp:51:15: warning: unused variable 'a' [-Wunused-variable] long long a, b, sum = 0; ^ main.cpp:51:18: warning: unused variable 'b' [-Wunused-variable] long long a, b, sum = 0; ^ main.cpp:52:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:54:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x[i], &y[i]); ^