WA了第十个

#include<bits/stdc++.h>
using namespace std;
string a[10000];
map<string,string>m;
int f(int w){
	w++;
	while(a[w]==" "){
		w++;
	}
	return w;
}
int f1(int w){
	w--;
	while(a[w]==" "){
		w--;
	}
	return w;
}
int main(){
	m["true"]="false";
	m["false"]="true";
	int n=1;
	while(cin>>a[n]){
		n++;
	}
	n--;
	int tem=0;
	int x;
	if(a[1]=="or"||a[1]=="and"||a[n]=="or"||a[n]=="and"||a[n]=="not"){
		cout<<"error";
		return 0;
	}
	for(int i=1;i<=n;i++){
		if(a[i]=="not"){
			if(tem==0){
				tem=1;
				x=i;
			}
			else{
				tem=0;
				a[x]=" ";
				a[i]=" ";
			}
			if(a[f(i)]=="or"||a[f(i)]=="and"){
				cout<<"error";
				return 0;
			}
		}
	}
	if(tem==1){
		a[f(x)]=m[a[f(x)]];
		a[x]=" ";
	}
	for(int i=1;i<=n;i++){
		if(a[i]=="and"){
			if(a[f(i)]=="or"||a[f(i)]=="and"){
				cout<<"error";
			}
			if(a[f1(i)]=="true"&&a[f(i)]=="true"){
				a[i]="true";
				a[f1(i)]=" ";
				a[f(i)]=" ";
			}
			else{
				a[i]="false";
				a[f1(i)]=" ";
				a[f(i)]=" ";
			}
		}
	}
	for(int i=1;i<=n;i++){
		if(a[i]=="or"){
			if(a[f(i)]=="or"){
				cout<<"error";
			}
			if(a[f1(i)]=="false"&&a[f(i)]=="false"){
				a[i]="false";
				a[f1(i)]=" ";
				a[f(i)]=" ";
			}
			else{
				a[i]="true";
				a[f1(i)]=" ";
				a[f(i)]=" ";
			}
		}
	}
	int www=-1;
	for(int i=1;i<=n;i++){
		if(a[i]!=" "&&www==-1){
			www=i;
		}
		else if(a[i]!=" "&&www!=-1){
			cout<<"error";
			return 0;
		}
	}
	if(www==-1){
		cout<<"error";
		return 0;
	}
	cout<<a[www];
	return 0;
}