Compilare: user.cpp: In function ‘int main()’: user.cpp:15:45: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(i<k) {v[i]=0;if(k<=i) v1[i]=(1<<i-k)%m;} ^ user.cpp:20:33: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(k<=i) v1[i]=(1<<i-k)%m; ^ user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("minusk.in","r",stdin); ^ user.cpp:10:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("minusk.out","w",stdout); ^ user.cpp:13:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^