Compilare: user.cpp: In function ‘int solve(int)’: user.cpp:15:32: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] rez=(v[3]+v[1]+2*(i-2))&M; ^ user.cpp: In function ‘int main()’: user.cpp:26:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("12perm.in","r",stdin); freopen("12perm.out","w",stdout); ^ user.cpp:26:69: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("12perm.in","r",stdin); freopen("12perm.out","w",stdout); ^ user.cpp:28:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^