Discussion Detail - XAZXOI

问答
WHY
leixinhang2012 LV 10 @ 2025-5-17 17:25:19

#include<bits/stdc++.h>

using namespace std;
int a,b,c;
int main(){
	string s;
	getline(cin,s);
	int n=s.size();
	string w;
	cout << s << endl;
	for(int i=0;i<n;i++){
		if(s[i]==';'){
			w+=s[i-4]+s[i-2]+s[i-1];
			cout << w<<endl;
			if(w[0]=='a'){
				a=w[2]-'0';
			}
			if(w[0]=='b'){
				if(w[2]=='a'){
					b=a;
				}
				else{
					b=w[2]-'0';//a:=1;b:=a;c:=3;
				}
			}
			if(w[0]=='c'){
				if(w[2]=='a'){
					c=a;
				}
				if(w[2]=='b'){
					c=b;
				}
				else{
					c=w[2]-'0';
				}
			}
		}
	}
	cout << a<<' '<<b<<' '<<c;
}

Csvoner SU @ 2025-5-27 19:11:20

明显错误：

string w;
w+=s[i-4]+s[i-2]+s[i-1];

string 作为字符串不能用 + 连接单个字符，这道题也没必要存储每一个等式，直接分情况判断赋值即可，参考代码如下：

#include <bits/stdc++.h>
using namespace std;

int x, y, z;

int main()
{
	string a;
	getline(cin, a);
	
	int len = a.size();
	for (int i = 0; i < len; i ++ )
	{
		if (a[i] == 'a')
		{
			if (a[i + 3] >= '0' && a[i + 3] <= '9') x = a[i + 3] - '0';
			if (a[i + 3] == 'b') x = y;
			if (a[i + 3] == 'c') x = z;
		}
		if (a[i] == 'b')
		{
			if (a[i + 3] >= '0' && a[i + 3] <= '9') y = a[i + 3] - '0';
			if (a[i + 3] == 'a') y = x;
			if (a[i + 3] == 'c') y = z;
		}
		if (a[i] == 'c')
		{
			if (a[i + 3] >= '0' && a[i + 3] <= '9') z = a[i + 3] - '0';
			if (a[i + 3] == 'a') z = x;
			if (a[i + 3] == 'b') z = y;
		}
//		cout << x << ' ' << y << ' ' << z << '\n';
	}
	
	cout << x << ' ' << y << ' ' << z << '\n';
	return 0;
}