Compilare: user.cpp: In function ‘int main()’: user.cpp:24:22: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(a[i] == a[j] && a[k] == a[l] || a[i] == a[k] && a[l] == a[j]) ^ user.cpp:26:27: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] else if(b[i] == b[j] && b[k] == b[l] || b[i] == b[k] && b[j] == b[l]) ^ user.cpp:12:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.cpp:15:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &a[i], &b[i]); ^