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S2OJ/1511/1511.cpp Normal file
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#include <iostream>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 1e5 + 5;
const int mod = 998244353;
int n, ans = 1;
int cnt1, cnt5, cnt7;
int cnt2, cnt3, cnt236;
int fac[N], inv[N], fac_inv[N];
inline int C(int n, int m) {
return static_cast<long long>(fac[n]) * fac_inv[m] % mod * fac_inv[n - m] % mod;
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
fac[0] = 1;
for (int i = 1; i < N; i++) {
fac[i] = static_cast<long long>(fac[i - 1]) * i % mod;
}
inv[0] = inv[1] = 1;
for (int i = 2; i < N; i++) {
inv[i] = static_cast<long long>(mod - (mod / i)) * inv[mod % i] % mod;
}
fac_inv[0] = fac_inv[1] = 1;
for (int i = 2; i < N; i++) {
fac_inv[i] = static_cast<long long>(fac_inv[i - 1]) * inv[i] % mod;
}
cin >> n;
for (int i = 1, x; i <= n; i++) {
cin >> x;
switch (x) {
case 1: {
cnt1++;
break;
}
case 5: {
cnt5++;
break;
}
case 7: {
cnt7++;
break;
}
case 2:
case 4:
case 8: {
cnt2++;
cnt236++;
break;
}
case 3:
case 9: {
cnt3++;
cnt236++;
break;
}
case 6: {
cnt236++;
ans = static_cast<long long>(ans) * fac[cnt2 + cnt3] % mod * fac_inv[cnt2] % mod * fac_inv[cnt3] % mod;
cnt2 = cnt3 = 0;
break;
}
}
}
ans = static_cast<long long>(ans) * fac[cnt2 + cnt3] % mod * fac_inv[cnt2] % mod * fac_inv[cnt3] % mod;
ans = static_cast<long long>(ans) * fac[cnt1 + cnt236 + cnt5 + cnt7] % mod * fac_inv[cnt1] % mod * fac_inv[cnt236] % mod * fac_inv[cnt5] % mod * fac_inv[cnt7] % mod;
cout << ans << endl;
return 0;
}

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#include <iostream>
#include <algorithm>
#include <set>
#include <vector>
using std::cin;
using std::cout;
const char endl = '\n';
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, a, b, c, d_up = 0, d_down = 0;
long long ans = 0;
cin >> n >> a >> b;
std::vector<int> nums, x(n);
for (int& x : x) {
cin >> x;
}
std::set<int> s1;
std::multiset<int> s2;
for (int i = 0; i < n; i++) {
s1.insert(x[i]);
s2.insert(x[i]);
if (i == 0) {
c = x[i];
} else { // i > 0
if (c > x[i]) {
ans += static_cast<long long>(a) * (c - x[i]);
d_down++;
} else if (c < x[i]) {
ans += static_cast<long long>(b) * (x[i] - c);
d_up++;
}
if (c != *s1.begin()) {
auto it = --s1.lower_bound(c);
int d = (d_up + s2.count(c)) * b - d_down * a;
if (d < 0 && c != *it) {
ans += static_cast<long long>(d) * (c - *it);
d_up += s2.count(c);
d_down -= s2.count(*it);
c = *it;
}
}
if (c != *s1.rbegin()) {
auto it = s1.upper_bound(c);
int d = (d_down + s2.count(c)) * a - d_up * b;
if (d < 0 && c != *it) {
ans += static_cast<long long>(d) * (*it - c);
d_up -= s2.count(*it);
d_down += s2.count(c);
c = *it;
}
}
}
cout << ans << endl;
}
return 0;
}

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