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38 lines (35 loc) · 921 Bytes
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asteroid-collision.cpp
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38 lines (35 loc) · 921 Bytes
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class Solution {
public:
vector<int> asteroidCollision(vector<int>& a) {
stack<int>s;
vector<int>v;
s.push(a[0]);
for(int i=1;i<a.size();i++){
if(a[i]>0) s.push(a[i]);
else{
int f=0;
while(s.empty()==false && s.top()>0 ){
if(s.top()==abs(a[i])){
s.pop();
f=1;
break;
}
else if(s.top()<abs(a[i])){
s.pop();
}
else{
f=1;
break;
}
}
if(f==0) s.push(a[i]);
}
}
while(s.empty()==false){
v.push_back(s.top());
s.pop();
}
reverse(v.begin(),v.end());
return v;
}
};