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3540. [Usaco2014 Open]Fair Photography

https://hydro.ac/d/bzoj/record/6322c4e1bdf9bc31d1607974
This commit is contained in:
Baoshuo Ren 2022-09-15 14:23:54 +08:00
parent 39e04e9b16
commit b1f483a26d
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
21 changed files with 107 additions and 0 deletions

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#include <iostream>
#include <algorithm>
#include <cstring>
#include <utility>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 1e5 + 5;
int n, f[N << 1], ans;
std::pair<int, char> cows[N];
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
memset(f, 0x3f, sizeof(f));
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> cows[i].first >> cows[i].second;
}
std::sort(cows + 1, cows + 1 + n);
f[n] = cows[1].first;
for (int i = 2, x = n; i <= n; i++) {
x += cows[i - 1].second == 'W' ? -1 : 1;
f[x] = std::min(f[x], cows[i].first);
}
for (int i = n << 1; i; i--) {
f[i] = std::min(f[i], f[i + 2]);
}
for (int i = 1, x = n; i <= n; i++) {
x += cows[i].second == 'W' ? -1 : 1;
ans = std::max(ans, cows[i].first - f[x]);
}
cout << ans << endl;
return 0;
}

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