feat: usaco
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106 changed files with 2569 additions and 52 deletions
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#include <bits/stdc++.h> // {{{
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// https://codeforces.com/blog/entry/96344
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#pragma GCC optimize("O2,unroll-loops")
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#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
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using namespace std;
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using i32 = int32_t;
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using u32 = uint32_t;
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using i64 = int64_t;
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using u64 = uint64_t;
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using f64 = double;
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using f128 = long double;
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template <typename T>
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constexpr T MIN = std::numeric_limits<T>::min();
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template <typename T>
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constexpr T MAX = std::numeric_limits<T>::max();
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#define all(x) (x).begin(), (x).end()
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#define rall(x) (x).rbegin(), (x).rend()
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#define ff first
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#define ss second
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#ifdef LOCAL
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#define db(...) std::print(__VA_ARGS__)
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#define dbln(...) std::println(__VA_ARGS__)
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#else
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#define db(...)
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#define dbln(...)
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#endif
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// }}}
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void solve() {
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i32 n;
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cin >> n;
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map<pair<i64, i64>, i64> m;
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m[{0, 0}] = 0;
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char dir;
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i64 delta;
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i64 x = 0, y = 0;
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i64 ans = MAX<i64>, t = 0;
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while (n--) {
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cin >> dir >> delta;
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i64 dx = 0, dy = 0;
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switch (dir) {
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case 'N':
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dy = 1;
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break;
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case 'E':
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dx = 1;
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break;
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case 'S':
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dy = -1;
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break;
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case 'W':
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dx = -1;
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break;
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}
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for (i64 i = 0; i < abs(delta); ++i) {
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++t;
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x += dx;
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y += dy;
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if (m.find({x, y}) != m.end()) {
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ans = min(ans, t - m[{x, y}]);
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}
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m[{x, y}] = t;
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}
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}
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if (ans == MAX<i64>)
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cout << "-1\n";
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else
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cout << ans << '\n';
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}
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int main() { // {{{
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cin.tie(nullptr)->sync_with_stdio(false);
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cin.exceptions(cin.failbit);
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#define PROBLEM_NAME "mowing"
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#ifdef LOCAL
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freopen("io/" PROBLEM_NAME ".in", "r", stdin);
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freopen("io/" PROBLEM_NAME ".out", "w", stdout);
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#else
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freopen(PROBLEM_NAME ".in", "r", stdin);
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freopen(PROBLEM_NAME ".out", "w", stdout);
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#endif
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solve();
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return 0;
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}
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// }}}
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