Compilare: user.cpp: In function ‘int main()’: user.cpp:68:12: warning: unused variable ‘N’ [-Wunused-variable] ll N; scanf("%s\n",s+1); v[0]=strlen(s+1); ^ user.cpp:63:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("doi.in","r",stdin); ^ user.cpp:64:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("doi.out","w",stdout); ^ user.cpp:65:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int T; scanf("%d",&T); ^ user.cpp:68:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] ll N; scanf("%s\n",s+1); v[0]=strlen(s+1); ^