Compilare: user.cpp: In function ‘int main()’: user.cpp:6:83: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifra.in","r",stdin),freopen("cifra.out","w",stdout),scanf("%d\n",&t); ^ user.cpp:6:83: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:6:83: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:14:106: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n",s),m=strlen(s),n=(m>1?((s[m-2]-'0')*10+s[m-1]-'0'):(s[m-1]-'0')),printf("%d\n",v[n]); ^