Submission #379295

#	Time	Username	Problem	Language	Result	Execution time	Memory
379295		MilosMilutinovic	Pairs (IOI07_pairs)	C++14	60 / 100	46 ms	4076 KiB

pairs

#include <bits/stdc++.h>
using namespace std;
#define ll long long
int n,d,m;
void Solve1D(){
    vector<int> x(n);
    for(int i=0;i<n;i++)scanf("%i",&x[i]);
    sort(x.begin(),x.end());
    ll ans=0;
    for(int i=0;i<n;i++){
        int bot=i,top=n-1,pos=i;
        while(bot<=top){
			int mid=bot+top>>1;
            if(x[mid]-x[i]<=d)pos=mid,bot=mid+1;
            else top=mid-1;
        }
        ans+=pos-i;
    }
    printf("%lld",ans);
}
const int N=200050;
int bit[N];
void Add(int x,int f){
    for(;x<N;x+=x&-x){
        bit[x]+=f;
    }
}
int Get(int x){
    int res=0;
    for(;x;x-=x&-x){
		res+=bit[x];
    }
    return res;
}
void Solve2D(){
    vector<int> x(n),y(n),sum(n),dif(n);
    for(int i=0;i<n;i++)scanf("%i%i",&x[i],&y[i]),sum[i]=x[i]+y[i],dif[i]=x[i]-y[i];
    vector<int> id(n);
    iota(id.begin(),id.end(),0);
    sort(id.begin(),id.end(),[&](int i,int j){
        return dif[i]<dif[j];
	});
    int j=0;
    ll ans=0;
    for(int i=0;i<n;i++){
        while(dif[id[i]]-dif[id[j]]>d){
            Add(sum[id[j]],-1);
			j++;
        }
        ans+=Get(min(N-1,sum[id[i]]+d))-Get(max(1,sum[id[i]]-d-1));
        Add(sum[id[i]],1);
    }
    printf("%lld",ans);
}
int main(){
	int b;scanf("%i%i%i%i",&b,&n,&d,&m);
    if(b==1)Solve1D();
    if(b==2)Solve2D();
    //if(b==3)Solve3D();
}

Compilation message (stderr)

pairs.cpp: In function 'void Solve1D()':
pairs.cpp:13:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   13 |    int mid=bot+top>>1;
      |            ~~~^~~~
pairs.cpp:7:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    7 |     for(int i=0;i<n;i++)scanf("%i",&x[i]);
      |                         ~~~~~^~~~~~~~~~~~
pairs.cpp: In function 'void Solve2D()':
pairs.cpp:37:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   37 |     for(int i=0;i<n;i++)scanf("%i%i",&x[i],&y[i]),sum[i]=x[i]+y[i],dif[i]=x[i]-y[i];
      |                         ~~~~~^~~~~~~~~~~~~~~~~~~~
pairs.cpp: In function 'int main()':
pairs.cpp:56:13: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   56 |  int b;scanf("%i%i%i%i",&b,&n,&d,&m);
      |        ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• 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: 8 / 8
• Subtask 10: 0 / 10
• Subtask 11: 0 / 10
• Subtask 12: 0 / 10
• Subtask 13: 0 / 10