Egaltati

#include <fstream>
#include <cstring>
using namespace std;
int V[26],n,uz[26];
char S[100][31];

int parsare(char *s);
void determinare(int p);

int parsare(char *s)
{
	/// sirul s poate fi A op B, op = +, *, sau s poate fi A
	/// A,B pot fi litere sau numere naturale
	char * p,op;
	int startA=0,startB; /// pozitia de start pentru A, respectiv B
	/// determinam tipul operatiei
	p=strchr(s,'+');
	if(p)
		op='+',startB=p-s+1;
	else
	{
		p=strchr(s,'*');
		if(p)
			op='*',startB=p-s+1;
		else
			op=0; /// nu avem operatie
	}
	int A,B;
	/// determinam valoarea lui A
	int i=startA;
	while(s[i]==' ')
		++i;
	if(s[i]>='a'&&s[i]<='z')
		if(uz[s[i]-'a'])
			A=V[s[i]-'a'];
		else
		{
			determinare(s[i]-'a');
			A=V[s[i]-'a'];
		}
	else
	{
		A=0;
		while((s[i]>='0'&&s[i]<='9'))
			A=10*A+s[i]-'0',++i;
	}
	if(op!=0)
	{
		/// determinam valoarea lui B
		i=startB;
		while(s[i]==' ')
			++i;
		if(s[i]>='a'&&s[i]<='z')
			if(uz[s[i]-'a'])
				B=V[s[i]-'a'];
			else
			{
				determinare(s[i]-'a');
				B=V[s[i]-'a'];
			}
		else
		{
			B=0;
			while((s[i]>='0'&&s[i]<='9'))
				B=10*B+s[i]-'0',++i;
		}
		if(op=='+')
			A+=B;
		else
			A*=B;
	}
	return A;
}

void determinare(int p)
{
	if(uz[p])
		return ;
	char L='a'+p;
	for(int i = 1 ; i <= n ; i ++)
		if(S[i][0] == L)
		{
			uz[p]=1;
			int j=0;
			while(S[i][j]!='=')
				++j;
			++j;
			while(S[i][j]==' ')
				++j;
			V[p]=parsare(S[i]+j);
			return;
		}
}

int main()
{
    ifstream f("egalitati.in");
	f>>n;
	f.getline(S[0],31);
	for(int i=1;i<=n;++i)
		f.getline(S[i],31);
	f.close();
	for(int i=0;i<26;++i)
		determinare(i);
    ofstream g("egalitati.out");
	for(int i=0;i<26;++i)
		if(uz[i])
			g<<(char)('a'+i)<<" = "<<V[i]<<'\n';
	g.close();
	return 0;
}