Compilare: user.cpp: In function ‘int main()’: user.cpp:20:18: warning: unused variable ‘s’ [-Wunused-variable] int n, i, j, s, t, d, k, w; ^ user.cpp:20:21: warning: unused variable ‘t’ [-Wunused-variable] int n, i, j, s, t, d, k, w; ^ user.cpp:20:24: warning: unused variable ‘d’ [-Wunused-variable] int n, i, j, s, t, d, k, w; ^ user.cpp:20:27: warning: unused variable ‘k’ [-Wunused-variable] int n, i, j, s, t, d, k, w; ^ user.cpp:17:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("energii.in","r",stdin); ^ user.cpp:18:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("energii.out","w",stdout); ^ user.cpp:22:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&w); ^ user.cpp:24:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&e[i],&c[i]); ^