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Memory Allocator_prog.cpp
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Memory Allocator_prog.cpp
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#include <bits/stdc++.h>
using namespace std;
bool less_than(pair<int,int> a,pair <int,int> b)
{ if(a.first < b.first)
return true;
else
return false;
}
int main()
{ long long int n;
long long int M;
cin>>n>>M;
vector <long long int> output;
vector <pair<long long int,long long int> >free;
free.push_back(make_pair(0,M));
vector<vector<pair<long long int,long long int> > >alloc(n);
vector <vector<long long int> > req;
long long int req_no=0;
char ch='A';
long long int pid=0;
long long int i,k,j;
bool found,pend;
bool found1;
while(ch!='H')
{ cin>>ch;
if(ch=='H')
break;
cin>>pid;
switch(ch)
{
case 'A':
long long int size;
cin>>size;
found=false;
for(i=0;i<free.size();++i)
{ if(free[i].second>=size){
found=true;
output.push_back(free[i].first);
alloc[pid].push_back(make_pair(free[i].first,size));
free[i].first+=size;
free[i].second-=size;
//sort(free.begin(),free.end());
if(free[i].second==0)
{ free.erase(free.begin()+i);
// i--;
}
break;
}}
if(!found)
{ long long int req_no=output.size();
vector <long long int> v{req_no,pid,size};
output.push_back(-1);
req.push_back(v);
}
break;
case 'D':
long long int add;
cin>>add;
found=false;
if(alloc[pid].size()==0)
found=false;
else
{
for(i=0;i<alloc[pid].size();++i)
{ if(alloc[pid][i].first==add)
{ found=true;
output.push_back(0);
vector <pair<long long int,long long int> >::iterator x=upper_bound(free.begin(),free.end(),alloc[pid][i],less_than);
free.insert(x,alloc[pid][i]); //INSERTION SORT
alloc[pid].erase(alloc[pid].begin()+i);
// i--;
/*vector <pair<long long int,long long int> >::iterator y=x;
y--;
if(x==free.begin()+1)
{ if(free[0].first+free[0].second==free[1].first)
{ free[0].second+=free[1].second;
free.erase(free.begin()+1);
}
}
if(x+1==free.end())
{
if(free[free.size()-2].first+free[free.size()-2].second==free[free.size()-1].first)
{ free[free.size()-2].second+=free[free.size()-1].second;
free.erase(free.begin()+free.size()-1);
}
}
else
{ if((*x).first+(*x).second==(*(x+1)).first)
{ (*x).second+=(*(x+1)).second;
free.erase(x+1);
}
if((*y).first+(*y).second==(*x).first)
{ (*y).second+=(*x).second;
free.erase(x);
}
}*/
long long int l;
for( l=0;l<free.size()-1;++l)
{ if(free[l].first+free[l].second==free[l+1].first)
{ free[l].second+=free[l+1].second;
free.erase(free.begin()+l+1);
l--;
}
}
/* for(l=0;l<free.size();++l){
if(free[l].second==0)
{free.erase(free.begin()+l);
l--;
}
}*/
for(k=0;k<req.size();k++)
{
for(j=0;j<free.size();++j)
{
if(free[j].second>=req[k][2]){
output[req[k][0]]=free[j].first;
alloc[req[k][1]].push_back(make_pair(free[j].first,req[k][2]));
//output.push_back(free[j].first);
free[j].first+=req[k][2];
free[j].second-=req[k][2];
req.erase(req.begin()+k);
k--;
if(free[j].second==0)
{ free.erase(free.begin()+j);
//j--;
}
break;
}
}
}
break;
}
}}
if(!found)
output.push_back(1);
break;
// Made by Rajas Bharambe
case 'T':
found=false;
pend=false;
//pending check
for(i=0;i<req.size();++i)
{
if(pid==req[i][1])
{
pend=true;
req.erase(req.begin()+i);
i--;
//output.push_back(-1);
}
}
//pending check
if(alloc[pid].size()==0)
found=false;
else{
found=true;
for(i=0;i<alloc[pid].size();++i)
{ //vector<pair<long long int,long long int>>a; //empty
//alloc[pid][i]=a;
free.insert(upper_bound(free.begin(),free.end(),alloc[pid][i],less_than),alloc[pid][i]);
}//sort(free.begin(),free.end());
long long int l;
for( l=0;l<free.size()-1;++l)
{ if(free[l].first+free[l].second==free[l+1].first)
{ free[l].second+=free[l+1].second;
free.erase(free.begin()+l+1);
l--;
//l--;
}
}
/* for(l=0;l<free.size();++l){
if(free[l].second==0)
{free.erase(free.begin()+l);
l--;
}
}*/
alloc[pid].clear();
for(k=0;k<req.size();k++)
{
for(j=0;j<free.size();++j)
{
if(free[j].second>=req[k][2]){
output[req[k][0]]=free[j].first;
alloc[req[k][1]].push_back(make_pair(free[j].first,req[k][2]));
//output.push_back(free[j].first);
free[j].first+=req[k][2];
free[j].second-=req[k][2];
req.erase(req.begin()+k);
k--;
if(free[j].second==0)
{ free.erase(free.begin()+j);
// j--;
}
break;
}
}
}}
if(!found)
{ /* if(pend==true)
output.push_back(-1);
else*/
output.push_back(1);
}
if(found)
{ output.push_back(0);
}
break;
}}
for( i=0;i<output.size();++i)
cout<<output[i]<<endl;
return 0;
}