Compilare: user.cpp: In function ‘int main()’: user.cpp:16:9: warning: unused variable ‘n’ [-Wunused-variable] int n, i, j, t, d, k; ^ user.cpp:16:15: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, t, d, k; ^ user.cpp:16:18: warning: unused variable ‘t’ [-Wunused-variable] int n, i, j, t, d, k; ^ user.cpp:16:21: warning: variable ‘d’ set but not used [-Wunused-but-set-variable] int n, i, j, t, d, k; ^ user.cpp:13:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ab.in","r",stdin); ^ user.cpp:14:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ab.out","w",stdout); ^ user.cpp:20:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",q); ^ user.cpp:35:22: warning: array subscript is below array bounds [-Warray-bounds] s += vn[k]; ^ user.cpp:36:17: warning: array subscript is below array bounds [-Warray-bounds] vn[k]++; ^