第二周的逻辑表达式的题，怎么解？提交以后显示超时！

<p>#include &lt;iostream&gt;</p><p>#include &lt;cstring&gt;</p><p>#include &lt;cstdlib&gt;</p><p>using namespace std;</p><p>bool factor_value();</p><p>bool term_value();</p><p>bool expression_value();</p><p><br ></p><p>int main()</p><p>{</p><p>&nbsp; &nbsp; int count = 1;</p><p>&nbsp; &nbsp; while(1){</p><p>&nbsp; &nbsp; &nbsp; &nbsp; if(expression_value()){</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; cout&lt;&lt;&quot;Expression &quot;&lt;&lt;count&lt;&lt;&quot;: V&quot;;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; }else{</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; cout&lt;&lt;&quot;Expression &quot;&lt;&lt;count&lt;&lt;&quot;: F&quot;;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; }</p><p>&nbsp; &nbsp; &nbsp; &nbsp; cin.get();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; count++;</p><p><br ></p><p>&nbsp; &nbsp; }</p><p><br ></p><p>&nbsp; &nbsp; return 0;</p><p>}</p><p>bool expression_value(){</p><p>&nbsp; &nbsp; bool result = factor_value();</p><p>&nbsp; &nbsp; bool more = true;</p><p>&nbsp; &nbsp; while(more){</p><p>&nbsp; &nbsp; &nbsp; &nbsp; char op = cin.peek();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; if(op=='&amp;'||op=='|'){</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; cin.get();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bool value = factor_value();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(op=='&amp;')</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; result = result&amp;&amp;value;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; else</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; result = result||value;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; }</p><p>&nbsp; &nbsp; &nbsp; &nbsp; else</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; more = false;</p><p>&nbsp; &nbsp; }</p><p>&nbsp; &nbsp; return result;</p><p>}</p><p>bool term_value(){</p><p>&nbsp; &nbsp; bool result = factor_value();</p><p>&nbsp; &nbsp; while(true){</p><p>&nbsp; &nbsp; &nbsp; &nbsp; char op = cin.peek();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; if(op=='|'||op=='&amp;'){</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; cin.get();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bool value = factor_value();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(op=='|'){</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; result &nbsp;=result||value;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; else{</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; result = result&amp;&amp;value;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }</p><p>&nbsp; &nbsp; &nbsp; &nbsp; }else{</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; break;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; }</p><p>&nbsp; &nbsp; }</p><p>&nbsp; &nbsp; return result;</p><p>}</p><p>bool factor_value(){</p><p>&nbsp; &nbsp; bool result = false;</p><p>&nbsp; &nbsp; char c = cin.peek();</p><p>&nbsp; &nbsp; if(c=='('){</p><p>&nbsp; &nbsp; &nbsp; &nbsp; cin.get();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; result = expression_value();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; cin.get();</p><p>&nbsp; &nbsp; &nbsp; &nbsp;}else{</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;switch(c){</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case 'V':</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; result = true;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; cin.get();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; break;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case 'F':</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; result = false;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; cin.get();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; break;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case '!':</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; cin.get();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; result =!expression_value();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; break;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case ' ':</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; cin.get();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; result = factor_value();</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;}</p><p><br ></p><p>&nbsp; &nbsp; &nbsp; &nbsp;}</p><p>&nbsp; &nbsp; return result;</p><p>}</p><p><br ></p>