Compilare: user.cpp: In function ‘int main()’: user.cpp:7:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen("fence.in","r",stdin);freopen("fence.out","w",stdout); ^ user.cpp:7:63: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen("fence.in","r",stdin);freopen("fence.out","w",stdout); ^ user.cpp:8:80: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd %hd %hd %hd %hd %hd %hd %hd\n",&ceri,&nl,&nc,&pret,&cn,&cs,&lv,&le); ^ user.cpp:10:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(j=1;j<=nc;j++){scanf("%hd ",&x);a[i][j]=x-pret;if (i<lv && j<cn);else if(i<le && j>cn);else if(i>lv && j<cs);else if(i>le && j>cs);else smax+=a[i][j];} ^