代码：

#include<bits/stdc++.h>
using namespace std;
struct ine
{
	int val;
	bool isg,eq;
};
struct cmp
{
	bool operator()(ine x,ine y)
	{
		if (x.val!=y.val)return x.val>y.val;
		if (x.isg!=y.isg)return !x.isg;
		if (x.isg)return !x.eq;
		return x.eq;
	}
};
priority_queue<ine,vector<ine>,cmp >q;
int n,sval,gval;
bool seq,geq;
char c;
string s;
int main()
{
	cin>>n>>c;
	for (int i=0;i<n;i++)
	{
		ine t;
		t.val=0;
		cin>>s;
		int sz=s.size(),now=2;
		bool negative=0;
		if (s[1]=='>')t.isg=1;
		else t.isg=0;
		if (s[2]=='=')
		{
			t.eq=1;
			now=3;
		}
		else t.eq=0;
		if (s[now]=='-')
		{
			now++;
			negative=1;
		}
		for (;now<sz;now++)t.val=t.val*10+s[now]-'0';
		if (negative)t.val*=-1;
		q.push(t);
	}
	bool smaller=0,isg=0;
	while (!q.empty())
	{
		ine t=q.top();
		q.pop();
		if (!t.isg)
		{
			if (!smaller)
			{
				if (t.eq)geq=1;
				gval=t.val;
			}
			smaller=1;
		}
		else if (smaller)
		{
			cout<<"No Answer!";
			return 0;
		}
		else
		{
			isg=1;
			if (t.eq)seq=1;
			else seq=0;
			sval=t.val;
		}
	}
	if (sval==gval)
	{
		if (seq&&geq)cout<<c<<'='<<sval;
		else cout<<"No Answer!";
		return 0;
	}
	if (!isg)
	{
		cout<<c<<'<';
		if (geq)cout<<'=';
		cout<<gval;
		return 0;
	}
	if (!smaller)
	{
		cout<<c<<'>';
		if (seq)cout<<'=';
		cout<<sval;
		return 0;
	}
	cout<<sval<<'<';
	if (seq)cout<<'=';
	cout<<c;
	cout<<'<';
	if (geq)cout<<'=';
	cout<<gval;
}

$\texttt{90分 Record (R200677441)}$

知道问题在哪里的大佬请 @HuangRuibo 谢谢