제출 #243527

#제출 시각아이디문제언어결과실행 시간메모리
243527ne4eHbKaZoltan (COCI16_zoltan)C++17
140 / 140
122 ms7416 KiB
//{ <defines>
using namespace std;
#include <bits/stdc++.h>

//#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;
struct pii {
    int first, second;
};
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 + 3;

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(register int i, pii v) { for(i++; i < N; i += i & -i) upd(f[i], v); }
inline pii fget(register int i) { pii v {0, 0}; for(; i; i -= i & -i) upd(v, f[i]); re v; }

bool u;
void count(pii *v) {
    if(u) clr(f, 0);
    u = true;
    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;
}

컴파일 시 표준 에러 (stderr) 메시지

zoltan.cpp: In function 'int m_bpow(ll, ll)':
zoltan.cpp:53:26: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     for(ll p = 1ll << 63 - __builtin_clzll(b); p; p >>= 1) {
                       ~~~^~~~~~~~~~~~~~~~~~~~
zoltan.cpp: At global scope:
zoltan.cpp:85:31: warning: ISO C++1z does not allow 'register' storage class specifier [-Wregister]
 inline void fupd(register int i, pii v) { for(i++; i < N; i += i & -i) upd(f[i], v); }
                               ^
zoltan.cpp:86:30: warning: ISO C++1z does not allow 'register' storage class specifier [-Wregister]
 inline pii fget(register int i) { pii v {0, 0}; for(; i; i -= i & -i) upd(v, f[i]); re v; }
                              ^
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