Submission #2603263
Source Code Expand
#include <bits/stdc++.h>
using namespace std;
#define NDEBUG
#ifdef DEBUG
#include "cout11.h"
#undef NDEBUG
#endif
#include <cassert>
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> ii;
typedef pair<ll,ll> llll;
typedef pair<double,double> dd;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<ii> vii;
typedef vector<vector<ii>> vvii;
typedef vector<ll> vll;
#define sz(a) int((a).size())
#define pb push_back
#define FOR(var,from,to) for(int var=(from);var<=(to);++var)
#define rep(var,n) for(int var=0;var<(n);++var)
#define rep1(var,n) for(int var=1;var<=(n);++var)
#define repC2(vari,varj,n) for(int vari=0;vari<(n)-1;++vari)for(int varj=vari+1;varj<(n);++varj)
#define ALL(c) (c).begin(),(c).end()
#define RALL(c) (c).rbegin(),(c).rend()
#define tr(i,c) for(auto i=(c).begin(); i!=(c).end(); ++i)
#define found(s,e) ((s).find(e)!=(s).end())
#define mset(arr,val) memset(arr,val,sizeof(arr))
#define mid(x,y) ((x)+((y)-(x))/2)
#define IN(x,a,b) ((a)<=(x)&&(x)<=(b))
#define INTSPACE 12
char _buf[INTSPACE*1000000 + 3];
int loadint() {
if (fgets(_buf, INTSPACE+3, stdin)==NULL) return 0;
return atoi(_buf);
}
int loadvec(vector<int>& v, int N=-1) {
if (N == -1) {
N = loadint();
if (N==0) return 0;
}
int bufsize = INTSPACE*N + 3;
if (fgets(_buf, bufsize, stdin)==NULL) return 0;
v.resize(N);
int i=0;
bool last = false;
for (char *p=&_buf[0]; ;) {
char *q = p;
while (*q > ' ') ++q;
if (*q == 0x0D || *q == 0x0A) last = true;
*q = 0;
v[i++] = atoi(p);
if (last || i == N) break;
p = q+1;
}
// assert(i <= N);
return i;
}
ll solve(int N, int D, vi& x) {
vector<ll> before(N,0), after(N,0);
rep(i,N){
//after
int ax = upper_bound(ALL(x), x[i]+D) - x.begin();
after[i] = ax - i - 1;
// printf(" after: %d\n", ax);
//before
int bx = lower_bound(ALL(x), x[i]-D) - x.begin();
before[i] = i - bx;
// printf(" before: %d\n", bx);
}
#ifdef DEBUG
cerr << before << endl;
cerr << after << endl;
#endif
ll ans = 0;
rep(i, N-2) {
ll a = after[i];
if (a < 2) continue;
// Xi .. Xk <= D
// i, ..., i+d としたら
// 2..after のdでそれぞれ d-1 // 2なら1 3なら2
// のΣ
// = Σ_2^a (d-1) = a(a-1)/2
ans -= a*(a-1) / 2;
}
// vector<ll> ac(N+1, 0);
// rep(i, N) ac[i+1] = ac[i] + imos[i];
// cerr << ac << endl;
for (int i=1; i<N-1; ++i) {
ans += before[i] * after[i];// - ac[1+i];
}
return ans;
}
int main() {
vi x(2);
loadvec(x, 2);
int n=x[0], d=x[1];
loadvec(x, n);
cout << solve(n,d,x) << endl;
return 0;
}
Submission Info
Submission Time |
|
Task |
C - 徒歩圏内 |
User |
naoya_t |
Language |
C++14 (GCC 5.4.1) |
Score |
400 |
Code Size |
2941 Byte |
Status |
AC |
Exec Time |
16 ms |
Memory |
3200 KB |
Judge Result
Set Name |
Sample |
All |
Score / Max Score |
0 / 0 |
400 / 400 |
Status |
|
|
Set Name |
Test Cases |
Sample |
sample-01.txt, sample-02.txt, sample-03.txt, sample-04.txt |
All |
01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, sample-01.txt, sample-02.txt, sample-03.txt, sample-04.txt |
Case Name |
Status |
Exec Time |
Memory |
01.txt |
AC |
15 ms |
3200 KB |
02.txt |
AC |
16 ms |
3200 KB |
03.txt |
AC |
11 ms |
3200 KB |
04.txt |
AC |
15 ms |
3200 KB |
05.txt |
AC |
15 ms |
3200 KB |
06.txt |
AC |
13 ms |
3200 KB |
07.txt |
AC |
13 ms |
2688 KB |
08.txt |
AC |
13 ms |
2688 KB |
09.txt |
AC |
1 ms |
256 KB |
10.txt |
AC |
13 ms |
3200 KB |
11.txt |
AC |
15 ms |
3200 KB |
12.txt |
AC |
12 ms |
3200 KB |
sample-01.txt |
AC |
1 ms |
256 KB |
sample-02.txt |
AC |
1 ms |
256 KB |
sample-03.txt |
AC |
1 ms |
256 KB |
sample-04.txt |
AC |
1 ms |
256 KB |