UVa1596 - Bug Hunt

#include<iostream>#include<string>#include<sstream>#include<map>using namespace std;string s0, s, s1, s2, left_value,right_value;int bug;map<string, unsigned int> a;map<string, string> value;string get_value(string x, string arr){    unsigned int t = 0;    string y, z;    if(x.find("[") == string::npos){        stringstream ss(x);        ss >> t;        if(arr != s0 && t >= a[arr]) bug = 1;        return x;    }    y = x.substr(0, x.find("["));    z = x.substr(x.find("[")+1, x.find_last_of("]") - 2);    z = get_value(z, y);    if(bug) return s0;    x = y + "[" + z + "]";    if( !value.count(x) ) bug = 1;    return value[x];}void get_arr(){    string x, y;    unsigned int z;    x = s.substr(0, s.find("["));    y = s.substr(s.find("[")+1, s.find_last_of("]"));    y = get_value(y, s0);    stringstream ss(y);    ss >> z;    a[x] = z;    return;}int main(){    int flag = 0, cnt = 1;    a[s0] = 0;    string arr, indx;    while( cin >> s ){        if(s != ".") flag = 1;        else if(!flag) break;        else {            if(!bug) cout << "0" << endl;            a.clear();            value.clear();            left_value = right_value = s0;            cnt = 1;            bug = flag = 0;            continue;        }        if(bug) continue;        if(s.find("=") == string::npos) get_arr();        else{            s1 = s.substr(0, s.find("="));            s2 = s.substr(s.find("=")+1);            arr = s1.substr(0, s1.find("["));            indx = s1.substr(s1.find("[")+1, s1.find_last_of("]") - 2);            indx = get_value(indx, arr);            stringstream ss(indx);            unsigned int t;            ss >> t;            if(t >= a[arr]) bug = 1;            left_value = arr + "[" + indx + "]";            right_value = get_value(s2, s0);            if(bug){                cout << cnt << endl;                continue;            }            value[left_value] = right_value;            left_value = right_value = s0;        }        cnt++;    }    return 0;}