这道题去我照着老师的打了一遍，不知道有没有打错 回家运行后发现有问题，还有就是pri函数不知道发哪个地方？

求各位大佬帮我调一下

题目链接

邀请码是 dzkw

#include <cstdio>
#include <stack>
#include <cmath>
#include <cstring>
using namespace std;

const int N = 1000005;

int a = 0;
char s[N];
int flag = 0;
stack<int> q;
stack<int> p;

int pri(char ch)
{
	if(ch == ' ') return 4;
	if(ch == '*' || ch == '/') return 3;
	if(ch == '+' || ch == '-') return 2;
	if(ch == '(' || ch == ')') return 1;
}

int main()
{
	scanf("%s", s + 1);
	int n = strlen(s + 1);
	for(int i = 1; i <= n; i ++)
	{
		char ch = s[i];
		int j = i;
		if(ch >= '0' && ch <= '9')
		{
			while(s[j] >= '0' && s[j] <= '9') a = a * 10 + s[j] - '0', j ++;
			i = j - 1;
			q.push(a);
			a = 0;
		}
		
		if(ch == '(') p.push('(');
		
		else if(ch == '(')
		{
			while(p.top() != '(')
			{
				int x = q.top();q.pop();
				int y = q.top();q.pop();
				char chi = p.top();
				if(chi == '+') q.push(y + x);
				if(chi == '-') q.push(y - x);
				if(chi == '*') q.push(y * x);
				if(chi == '/') q.push(y / x);
				if(chi == '^') q.push(pow(y, x));
				p.pop();
			}
			
			p.push(ch);
		}
	}
	while(!p.empty())
	{
		int x = q.top();q.pop();
		int y = q.top();q.pop();
		char chi = p.top();
		if(chi == '+') q.push(y + x);
		if(chi == '-') q.push(y - x);
		if(chi == '*') q.push(y * x);
		if(chi == '/') q.push(y / x);
		if(chi == '^') q.push(pow(y, x));
		p.pop();
	}
	printf("%d", q.top());
	return 0;
}