Compilare: user.cpp: In function ‘int main()’: user.cpp:79:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(common[v[j]]) ^ user.cpp:104:63: warning: suggest parentheses around assignment used as truth value [-Wparentheses] for(int j = i + 1; j < n; j++) common[v[j]] = f[v[j]] = 0; ~~~~~~~~^~~ user.cpp:47:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &n); ^ user.cpp:50:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &v[i]); ^