Compilare: user.cpp: In function ‘int main()’: user.cpp:15:45: warning: left operand of comma operator has no effect [-Wunused-value] if(Sum > Sum2 * k) return 0, printf("-1"); ^ user.cpp:19:45: warning: left operand of comma operator has no effect [-Wunused-value] if(Sum > Sum2) return 0, printf("-1"); ^ user.cpp:22:38: warning: left operand of comma operator has no effect [-Wunused-value] if(Sum > 0) return 0, printf("-1"); ^ user.cpp:10:9: warning: unused variable ‘i1’ [-Wunused-variable] int i1 = 0, i2 = 0, i3 = 0; ^ user.cpp:10:17: warning: unused variable ‘i2’ [-Wunused-variable] int i1 = 0, i2 = 0, i3 = 0; ^ user.cpp:10:25: warning: unused variable ‘i3’ [-Wunused-variable] int i1 = 0, i2 = 0, i3 = 0; ^ user.cpp:7:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ksecv3.in", "r", stdin); ^ user.cpp:8:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ksecv3.out", "w", stdout); ^ user.cpp:9:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ user.cpp:13:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]), Sum = Sum + a[i]; ^