Compilare: user.cpp: In function ‘int main()’: user.cpp:20:12: warning: unused variable ‘a’ [-Wunused-variable] int n, a, b, c; ^ user.cpp:20:15: warning: unused variable ‘b’ [-Wunused-variable] int n, a, b, c; ^ user.cpp:20:18: warning: unused variable ‘c’ [-Wunused-variable] int n, a, b, c; ^ user.cpp:17:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("inundatii.in", "r", stdin); ^ user.cpp:18:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("inundatii.out", "w", stdout); ^ user.cpp:21:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:23:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x[i], &y[i], &z[i]); ^