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ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#330823 | #8055. Balance | ucup-team1191# | TL | 0ms | 0kb | C++20 | 2.5kb | 2024-02-17 19:29:13 | 2024-02-17 19:29:14 |
answer
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define TIME (clock() * 1.0 / CLOCKS_PER_SEC)
const int ALPHA = 256;
const int BETA = 100;
const int M = 5000;
const int BIAS = (M / 2);
int cnt[M + 1];
ll calc(const vector<int>& p, int alpha, int beta) {
ll ans = 0;
int n = p.size();
for (int i = 0; i < n; i++) {
int f = ((n - 1) / 2) - p[i];
f = max(1, abs(f) - beta);
int l = max(((n + f - 1) / f) * alpha, beta);
int L = max(0, i - l);
int R = min(n - 1, i + l);
memset(cnt + BIAS - min(l + 1, BIAS), 0, 2 * min(l + 1, BIAS) * sizeof(int));
int bal = BIAS;
for (int j = i - 1; j >= L - 1; j--) {
cnt[bal]++;
if (j == L - 1) {
break;
}
if (p[j] < p[i]) {
bal++;
} else {
bal--;
}
}
ll cur = 0;
bal = BIAS;
for (int j = i + 1; j <= R + 1; j++) {
cur += (ll)cnt[bal];
cur += (ll)cnt[bal - 1];
if (j == R + 1) {
break;
}
if (p[j] < p[i]) {
bal--;
} else {
bal++;
}
}
ans += cur * (p[i] + 1);
}
return ans;
}
void solve() {
int n;
cin >> n;
vector<int> p(n);
for (int i = 0; i < n; i++) {
cin >> p[i];
p[i]--;
}
cout << calc(p, ALPHA, BETA) << "\n";
}
void test(int n) {
mt19937 rnd(239);
vector<int> p(n);
iota(p.begin(), p.end(), 0);
for (int it = 0; it < 10; it++) {
shuffle(p.begin(), p.end(), rnd);
for (int k = 0; k <= 10; k++) {
double start = TIME;
cout << k << " " << calc(p, (1 << k), 100) << "\n";
cout << TIME - start << "\n";
}
cout << "___\n";
}
}
void once(int n) {
mt19937 rnd(239);
vector<int> p(n);
iota(p.begin(), p.end(), 0);
shuffle(p.begin(), p.end(), rnd);
cout << calc(p, ALPHA, BETA) << "\n";
}
int main() {
#ifdef ONPC
freopen("input", "r", stdin);
#endif
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
once(300'000);
cerr << TIME << "\n";
return 0;
int t = 1;
//cin >> t;
while (t--) {
solve();
}
return 0;
}
详细
Test #1:
score: 0
Time Limit Exceeded
input:
5 5 4 1 2 2 3 3 4 4 5 1 2 3 4 5 5 4 1 2 1 3 1 4 1 5 1 2 3 4 5 5 4 1 2 1 3 1 4 1 5 1 2 2 2 3 5 6 1 2 1 2 2 3 3 4 4 5 3 5 1 2 1 2 1 2 2 1 2 1 2 1 2