Compilare: user.cpp: In function ‘int main()’: user.cpp:58:43: warning: operation on ‘num’ may be undefined [-Wsequence-point] s[++num]=s[num-1]+s[num-2]; ^ user.cpp:58:43: warning: operation on ‘num’ may be undefined [-Wsequence-point] user.cpp:14:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&p,&N,&K); ^ user.cpp:21:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%lld",&x); ^ user.cpp:42:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%llu",&v[i]); ^