Compilare: main.cpp: In function 'int main()': main.cpp:19:15: warning: unused variable 'k' [-Wunused-variable] int n,i,j,k,st,dr; ^ main.cpp:19:17: warning: unused variable 'st' [-Wunused-variable] int n,i,j,k,st,dr; ^~ main.cpp:19:20: warning: unused variable 'dr' [-Wunused-variable] int n,i,j,k,st,dr; ^~ main.cpp:15:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("subsir2.in","r",stdin); ^ main.cpp:17:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("subsir2.out","w",stdout); ^ main.cpp:21:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:25:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^