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P3105 [USACO14OPEN]Fair Photography S
https://www.luogu.com.cn/record/83996634
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Luogu/P3105/P3105.cpp
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Luogu/P3105/P3105.cpp
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#include <iostream>
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#include <algorithm>
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#include <cstring>
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#include <utility>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 1e5 + 5;
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int n, f[N << 1], ans;
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std::pair<int, char> cows[N];
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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memset(f, 0x3f, sizeof(f));
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cin >> n;
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for (int i = 1; i <= n; i++) {
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cin >> cows[i].first >> cows[i].second;
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}
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std::sort(cows + 1, cows + 1 + n);
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f[n] = cows[1].first;
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for (int i = 2, x = n; i <= n; i++) {
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x += cows[i - 1].second == 'W' ? -1 : 1;
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f[x] = std::min(f[x], cows[i].first);
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}
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for (int i = n << 1; i; i--) {
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f[i] = std::min(f[i], f[i + 2]);
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}
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for (int i = 1, x = n; i <= n; i++) {
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x += cows[i].second == 'W' ? -1 : 1;
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ans = std::max(ans, cows[i].first - f[x]);
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}
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cout << ans << endl;
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return 0;
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}
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