//{ <defines>
#include <bits/stdc++.h>
using namespace std;
//#pragma comment(linker, "/stack:200000000")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,-O3")
#define fr(i, n) for(int i = 0; i < n; ++i)
#define fo(n) fr(i, n)
#define re return
#define ef else if
#define ifn(x) if(!(x))
#define _ << ' ' <<
#define ft first
#define sd second
#define ve vector
#define pb push_back
#define eb emplace_back
#define sz(x) int((x).size())
#define bnd(x) x.begin(), x.end()
#define clr(x, y) memset((x), (y), sizeof (x))
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef ve<int> vi;
inline ll time() {re chrono :: system_clock().now().time_since_epoch().count();}
mt19937 rnd(time());
mt19937_64 RND(time());
template<typename t> inline void umin(t &a, t b) {a = min(a, b);}
template<typename t> inline void umax(t &a, t b) {a = max(a, b);}
int md = 998244353;
inline int m_add(int&a, int b) {a += b; if(a < 0) a += md; if(a >= md) a -= md; re a;}
inline int m_sum(int a, int b) {a += b; if(a < 0) a += md; if(a >= md) a -= md; re a;}
inline int m_mul(int&a, int b) {re a = 1ll * a * b % md;}
inline int m_prod(int a, int b) {re 1ll * a * b % md;}
int m_bpow(ll A, ll b) {
int a = A % md;
ll ans = 1;
for(ll p = 1ll << 63 - __builtin_clzll(b); p; p >>= 1) {
(ans *= ans) %= md;
if(p & b)
(ans *= a) %= md;
}
re ans;
}
//const ld pi = arg(complex<ld>(-1, 0));
//const ld pi2 = pi + pi;
const int oo = 2e9;
const ll OO = 4e18;
//} </defines>
const int N = 2e5 + 5;
int n, m;
int a[N], p2[N];
pii le[N], gr[N];
inline void upd(pii &a, const pii &b) {
if(b.ft >= a.ft) {
if(b.ft == a.ft) {
a.sd += b.sd;
if(a.sd >= md) a.sd -= md;
} else {
a = b;
}
}
}
pii f[N];
inline void fupd(int i, pii v) { for(i++; i < N; i += i & -i) upd(f[i], v); }
inline pii fget(int i) { pii v {0, 0}; for(; i; i -= i & -i) upd(v, f[i]); re v; }
void count(pii *v) {
clr(f, 0);
for(int i = 0; i < n; ++i) {
v[i] = {0, 1};
upd(v[i], fget(a[i]));
v[i].ft++;
fupd(a[i], v[i]);
}
}
void solve() {
md = 1e9 + 7;
for(int i = 0; i < N; ++i) p2[i] = !i ? 1 : m_sum(p2[i - 1], p2[i - 1]);
cin >> n;
fo(n) cin >> a[n - 1 - i];
int *b = (int*) memcpy(malloc(n << 2), a, n << 2);
sort(b, b + n);
m = unique(b, b + n) - b;
for(int i = 0; i < n; ++i) {
a[i] = lower_bound(b, b + m, a[i]) - b + 1;
}
count(le);
fo(n) a[i] = m + 1 - a[i];
count(gr);
int M = 1;
fo(n) umax(M, le[i].ft + gr[i].ft - 1);
int ans = 0;
for(int i = 0; i < n; ++i) {
if(le[i].ft + gr[i].ft < M + 1) continue;
m_add(ans, m_prod(p2[n - M], m_prod(le[i].sd, gr[i].sd)));
}
cout << M _ ans << endl;
}
int main() {
cout.precision(15); cout << fixed;
cerr.precision(15); cerr << fixed;
#ifdef _LOCAL
freopen("in.txt", "r", stdin);
int tests; cin >> tests;
for(int test = 1; test <= tests; ++test) {
cerr << "case #" << test << endl;
solve();
cerr << endl;
}
#else
// freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout);
ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0);
solve();
#endif
return 0;
}
Compilation message
zoltan.cpp: In function 'int m_bpow(ll, ll)':
zoltan.cpp:50:26: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
for(ll p = 1ll << 63 - __builtin_clzll(b); p; p >>= 1) {
~~~^~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
7 ms |
2688 KB |
Output is correct |
| 2 |
Correct |
7 ms |
2688 KB |
Output is correct |
| 3 |
Correct |
7 ms |
2688 KB |
Output is correct |
| 4 |
Correct |
6 ms |
2688 KB |
Output is correct |
| 5 |
Correct |
7 ms |
2688 KB |
Output is correct |
| 6 |
Correct |
7 ms |
2688 KB |
Output is correct |
| 7 |
Correct |
7 ms |
2688 KB |
Output is correct |
| 8 |
Correct |
7 ms |
2688 KB |
Output is correct |
| 9 |
Correct |
7 ms |
2688 KB |
Output is correct |
| 10 |
Correct |
8 ms |
2688 KB |
Output is correct |
| 11 |
Correct |
78 ms |
6524 KB |
Output is correct |
| 12 |
Correct |
68 ms |
6008 KB |
Output is correct |
| 13 |
Correct |
64 ms |
5752 KB |
Output is correct |
| 14 |
Correct |
89 ms |
6008 KB |
Output is correct |
| 15 |
Correct |
106 ms |
6776 KB |
Output is correct |
| 16 |
Correct |
131 ms |
7416 KB |
Output is correct |
| 17 |
Correct |
87 ms |
7340 KB |
Output is correct |
| 18 |
Correct |
87 ms |
7420 KB |
Output is correct |
| 19 |
Correct |
86 ms |
7416 KB |
Output is correct |
| 20 |
Correct |
86 ms |
7384 KB |
Output is correct |
