Compilare: user.cpp: In function ‘int main()’: user.cpp:2:159: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] void solve(int b,int p,int e){if(e==1){printf("%d ",b);return;}int m=e>>1;solve(b,p<<1,e-m);solve(b+p,p<<1,m);}int main(void){freopen("permavg.in","rt",stdin);freopen("permavg.out","wt",stdout);int N;scanf("%d",&N);solve(1,1,N);return 0;} ^ user.cpp:2:194: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] void solve(int b,int p,int e){if(e==1){printf("%d ",b);return;}int m=e>>1;solve(b,p<<1,e-m);solve(b+p,p<<1,m);}int main(void){freopen("permavg.in","rt",stdin);freopen("permavg.out","wt",stdout);int N;scanf("%d",&N);solve(1,1,N);return 0;} ^ user.cpp:2:215: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] void solve(int b,int p,int e){if(e==1){printf("%d ",b);return;}int m=e>>1;solve(b,p<<1,e-m);solve(b+p,p<<1,m);}int main(void){freopen("permavg.in","rt",stdin);freopen("permavg.out","wt",stdout);int N;scanf("%d",&N);solve(1,1,N);return 0;} ^