Submission #891195

#	Time	Username	Problem	Language	Result	Execution time	Memory
891195		Faisal_Saqib	Pairs (IOI07_pairs)	C++17	92 / 100	1726 ms	524288 KiB

pairs

#pragma optimze("Ofast")
#include <iostream>
#include <vector>
#include <algorithm>
#include <bitset>
using namespace std;
// #define endl '\n'
const int N=76;
int pre[N][N][N];
// bool have1[N];
bitset<100> have1;
int have3[N][N][N];
int main()
{
	  ios::sync_with_stdio(false);
	  cout.tie(NULL);
	  cin.tie(NULL);
	int b,m;
	cin>>b;
	if(b==1)
	{
		int n,d;
		cin>>n>>d>>m;
		vector<int> a;
		for(int i=0;i<n;i++)
		{
			int x;
			cin>>x;
			a.push_back(x);
		}
		long long cnt=0;
		sort(begin(a),end(a));
		int i=0;
		for(int j=0;j<n;j++)
		{
			while(i<n and a[i]<(a[j]-d))
			{
				i++;
			}
			cnt+=(j-i);
		}
		cout<<cnt<<'\n';
	}
	else if(b==2)
	{
		// exit(-1);
		int n,d;
		cin>>n>>d>>m;
		vector<pair<int,int>> a;
		vector<vector<int>> pre1;
		vector<int> ap;
		// for(int i=0;i<=m;i++)
		// 	ap.push_back(0);
		for(int j=0;j<=m;j++)
			pre1.push_back(ap);
		for(int i=0;i<n;i++)
		{
			int x,y;
			cin>>x>>y;
			a.push_back({x,y});
			while(pre1[x].size()<=m)
			{
				pre1[x].push_back(0);
			}
			while(y<=m)
			{
				pre1[x][y]++;
				y++;
			}
		}
		long long cnt=0;
		for(int i=0;i<n;i++)
		{
			int x=a[i].first;
			int y=a[i].second;
			for(int dx=0;dx<=d and dx<=(m-1);dx++)
			{
				int dy=d-dx;
				if((x+dx)<=m and pre1[x+dx].size()>0)
				{
					cnt+=(pre1[(x+dx)][min(m,y+dy)]-pre1[x+dx][max(0,y-dy-1)])-(dx==0);
				}
				if((x-dx)>0 and dx!=0  and pre1[x-dx].size()>0)
				{
					cnt+=(pre1[(x-dx)][min(m,y+dy)]-pre1[x-dx][max(0,y-dy-1)]);
				}
			}
			// cout<<"For "<<i<<' '<<cnt<<endl;
		}
		cout<<cnt/2<<'\n';
	}
	else
	{
		int n,d;
		cin>>n>>d>>m;
		vector<pair<int,pair<int,int>>> a;
		for(int i=0;i<n;i++)
		{
			int x,y,z;
			cin>>x>>y>>z;
			a.push_back({x,{y,z}});
			have1[x]=1;
			have3[x][y][z]++;
			while(z<=m)
			{
				pre[x][y][z]++;
				z++;
			}
		}
		long long cnt=0;
		d=min(d,(m-1)*b);
		sort(begin(a),end(a));
		a.resize(unique(begin(a),end(a))-begin(a));
		for(int i=0;i<a.size();i++)
		{
			int x=a[i].first,y=a[i].second.first,z=a[i].second.second;
			int p=0;
			for(int dx=0;dx<=(d) and dx<=(m-1);dx++)
			{
				if((x+dx>m or !have1[x+dx]) and ((x-dx)<=0 or !have1[x-dx]))
					continue;
				for(int dy=0;dy<=(m-1) and dy<=d and (dy+dx)<=d and (dy+dx)<=(2*(m-1));dy++)
				{
					int dz=d-(dy+dx);
					if((x+dx)<=m)
					{
						if((y+dy)<=m)
						{
							p+=(pre[x+dx][y+dy][min(m,z+dz)]-pre[x+dx][y+dy][max(0,z-dz-1)])-((dx==0) and (dy==0));
						}
						if((y-dy)>0 and (dy!=0))
						{
							p+=(pre[x+dx][y-dy][min(m,z+dz)]-pre[x+dx][y-dy][max(0,z-dz-1)])-((dx==0) and (dy==0));
						}
					}
					if((x-dx)>0 and (dx!=0))
					{
						if((y+dy)<=m)
						{
							p+=(pre[x-dx][y+dy][min(m,z+dz)]-pre[x-dx][y+dy][max(0,z-dz-1)])-((dx==0) and (dy==0));
						}
						if((y-dy)>0 and (dy!=0))
						{
							p+=(pre[x-dx][y-dy][min(m,z+dz)]-pre[x-dx][y-dy][max(0,z-dz-1)])-((dx==0) and (dy==0));
						}
					}
				}
			}
			cnt+=p*have3[x][y][z];
		}
		cout<<cnt/2<<'\n';
	}
	return 0;
}

Compilation message (stderr)

pairs.cpp:1: warning: ignoring '#pragma optimze ' [-Wunknown-pragmas]
    1 | #pragma optimze("Ofast")
      | 
pairs.cpp: In function 'int main()':
pairs.cpp:61:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   61 |    while(pre1[x].size()<=m)
      |          ~~~~~~~~~~~~~~^~~
pairs.cpp:114:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  114 |   for(int i=0;i<a.size();i++)
      |               ~^~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 6 / 6
• Subtask 3: 6 / 6
• Subtask 4: 6 / 6
• Subtask 5: 6 / 6
• Subtask 6: 7 / 7
• Subtask 7: 7 / 7
• Subtask 8: 8 / 8
• Subtask 9: 0 / 8
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10
• Subtask 12: 10 / 10
• Subtask 13: 10 / 10