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답안 #250707

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
250707 2020-07-18T20:02:42 Z Blagojce Mountains (NOI20_mountains) C++11
22 / 100
 107 ms 9200 KB 
#include <bits/stdc++.h> 
#define fr(i, n, m) for(int i = (n); i < (m); i ++)
#define pb push_back
#define st first
#define nd second
#define pq priority_queue
#define all(x) begin(x), end(x)
#include <time.h>
#include <cmath>

using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;

const int i_inf = 1e9;
const ll inf = 1e18;
const ll mod = 1000000007;
const ld eps = 1e-13;
const ld pi  = 3.14159265359;
 
mt19937 _rand(time(NULL));
clock_t timer = clock();
const int mxn = 5e5;
 
const ll A = 911382323;
const ll B = 972663749;
 
ll modpow(ll x, ll n){
	if(n == 0) return 1%mod;
	ll u = modpow(x, n/2);
	u = (u * u) % mod;
	if(n % 2) u = (u * x) % mod;
	return u;
}
ll inverse(ll x){
	return modpow(x, mod-2);
}
ll add(ll ans, ll val){
	ans = (ans + val) % mod;
	return ans;
}
ll mul(ll ans, ll val){
	ans = (ans * val) % mod;
	return ans;
}
ll sub(ll ans, ll val){
	ans = (ans - val) % mod;
	if(ans < 0) ans += mod;
	return ans;
}
ll _div(ll ans, ll val){
	ans = (ans * inverse(val)) % mod;
	return ans;
}
ll fakt[mxn];
ll bc(ll n, ll k){
	return (fakt[n]*inverse((fakt[k]*fakt[n-k])%mod))%mod;
}
ll sq(ll x){
	return x*x;
}
ll rsum(ll a, ll b){
	return (b-a+1)*(a+b)/2;
}
void prec(){
	fakt[0] = 1;
	fr(i, 1, mxn){
		fakt[i] = mul(fakt[i-1], i);
	}
}

int bit[mxn];
void update(int k, int val){
	while(k < mxn){
		bit[k] += val;
		k += k&-k;
	}
}
int sum(int k){
	int s = 0;
	while(k > 0){
		s += bit[k];
		k -= k&-k;
	}
	return s;
}
void solve(){
	int n;
	cin >> n;
	int a[n];
	vector<pii> v;
	fr(i, 0, n){
		cin >> a[i];
		v.pb({a[i], i});
	}
	sort(all(v));
	int val = 0;
	int pr = -1;
	for(auto u : v){
		if(u.st != pr) pr = u.st, ++val;
		a[u.nd] = val;
		pr = u.st;
		
	}
	
	ll le[n];
	ll ri[n];
	fr(i, 0, n){
		le[i] = sum(a[i]-1);
		update(a[i], +1);
	}
	fr(i, 0, n) update(a[i],-1);
	
	for(int i = n-1; i >= 0; i --){
		ri[i] = sum(a[i]-1);
		update(a[i], +1);
	}
	ll ans = 0;
	fr(i, 0, n){
		ans += le[i]*ri[i];
	}
	cout<<ans<<endl;
	
	
}
 
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	solve();
}

Subtask #1
0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 384 KB Output is correct
2 Incorrect 54 ms 8672 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 87 ms 8668 KB Output is correct
2 Correct 92 ms 8796 KB Output is correct
3 Correct 90 ms 8672 KB Output is correct
4 Correct 87 ms 8976 KB Output is correct
5 Correct 88 ms 8672 KB Output is correct
6 Correct 90 ms 8800 KB Output is correct
7 Correct 91 ms 8800 KB Output is correct
8 Correct 68 ms 8672 KB Output is correct
9 Correct 70 ms 8676 KB Output is correct
10 Correct 0 ms 384 KB Output is correct

Subtask #3
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 87 ms 8668 KB Output is correct
2 Correct 92 ms 8796 KB Output is correct
3 Correct 90 ms 8672 KB Output is correct
4 Correct 87 ms 8976 KB Output is correct
5 Correct 88 ms 8672 KB Output is correct
6 Correct 90 ms 8800 KB Output is correct
7 Correct 91 ms 8800 KB Output is correct
8 Correct 68 ms 8672 KB Output is correct
9 Correct 70 ms 8676 KB Output is correct
10 Correct 0 ms 384 KB Output is correct
11 Correct 93 ms 8800 KB Output is correct
12 Correct 96 ms 8800 KB Output is correct
13 Correct 92 ms 8672 KB Output is correct
14 Correct 100 ms 8800 KB Output is correct
15 Correct 102 ms 8672 KB Output is correct
16 Correct 94 ms 8672 KB Output is correct
17 Correct 99 ms 8680 KB Output is correct
18 Correct 68 ms 8676 KB Output is correct
19 Correct 62 ms 8672 KB Output is correct
20 Correct 0 ms 384 KB Output is correct

Subtask #4
0 / 36.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 28.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 87 ms 8668 KB Output is correct
2 Correct 92 ms 8796 KB Output is correct
3 Correct 90 ms 8672 KB Output is correct
4 Correct 87 ms 8976 KB Output is correct
5 Correct 88 ms 8672 KB Output is correct
6 Correct 90 ms 8800 KB Output is correct
7 Correct 91 ms 8800 KB Output is correct
8 Correct 68 ms 8672 KB Output is correct
9 Correct 70 ms 8676 KB Output is correct
10 Correct 0 ms 384 KB Output is correct
11 Correct 93 ms 8800 KB Output is correct
12 Correct 96 ms 8800 KB Output is correct
13 Correct 92 ms 8672 KB Output is correct
14 Correct 100 ms 8800 KB Output is correct
15 Correct 102 ms 8672 KB Output is correct
16 Correct 94 ms 8672 KB Output is correct
17 Correct 99 ms 8680 KB Output is correct
18 Correct 68 ms 8676 KB Output is correct
19 Correct 62 ms 8672 KB Output is correct
20 Correct 0 ms 384 KB Output is correct
21 Correct 100 ms 9060 KB Output is correct
22 Correct 103 ms 9056 KB Output is correct
23 Correct 102 ms 9188 KB Output is correct
24 Correct 100 ms 9060 KB Output is correct
25 Correct 100 ms 9200 KB Output is correct
26 Correct 107 ms 9056 KB Output is correct
27 Correct 99 ms 9056 KB Output is correct
28 Correct 71 ms 9056 KB Output is correct
29 Correct 72 ms 9056 KB Output is correct
30 Correct 0 ms 384 KB Output is correct

Subtask #7
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 384 KB Output is correct
2 Incorrect 54 ms 8672 KB Output isn't correct
3 Halted 0 ms 0 KB -