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ChefandIcecream.cpp
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ChefandIcecream.cpp
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#include <iostream>
using namespace std;
int main() {
// your code goes here
int Testcases;
cin>>Testcases;
for(int i=0;i<Testcases;i++){
int N,cost5,cost10,cost15;
cin>>N;
int value=0;
cost5=cost10=cost15=0;
int cost[N];
for(int j=0;j<N;j++){
cin>>cost[j];
if(cost[0]!=5){
value=1;
}
else{
if(cost[j]==5){
cost5=cost5+1;
}
else if(cost[j]==10){
cost10=cost10+1;
if(cost5==0){
value=1;
}
else{
cost5=cost5-1;
}
}
else if(cost[j]==15){
cost15=cost15+1;
if(cost10==0){
if(cost5<2){
value=1;
}
else if(cost5>=2){
cost5=cost5-2;
}
}
else{
cost10=cost10-1;
}
}
}
}
if(value==0){
cout<<"YES";
cout<<endl;
}
if(value==1){
cout<<"NO";
cout<<endl;
}
}
return 0;
}