Compilare: user.cpp: In function ‘int main()’: user.cpp:20:21: warning: unused variable ‘s’ [-Wunused-variable] int n, m, i, j, s, t, d, k; ^ user.cpp:20:24: warning: unused variable ‘t’ [-Wunused-variable] int n, m, i, j, s, t, d, k; ^ user.cpp:20:27: warning: unused variable ‘d’ [-Wunused-variable] int n, m, i, j, s, t, d, k; ^ user.cpp:17:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("note.in","r",stdin); ^ user.cpp:18:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("note.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,&m); ^ user.cpp:25:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ user.cpp:30:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ user.cpp:31:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for( i = 1; i <= k; ++i ) scanf("%d",&v[i]); ^