제출 #832107

#제출 시각아이디문제언어결과실행 시간메모리
832107maomao90Arranging Shoes (IOI19_shoes)C++17
10 / 100
6 ms9684 KiB
// I can do all things through Christ who strengthens me // Philippians 4:13 #include "shoes.h" #include "bits/stdc++.h" using namespace std; #define REP(i, j, k) for (int i = j; i < (k); i++) #define RREP(i, j, k) for (int i = j; i >= (k); i--) template <class T> inline bool mnto(T &a, const T b) {return a > b ? a = b, 1 : 0;} template <class T> inline bool mxto(T &a, const T b) {return a < b ? a = b, 1 : 0;} typedef long long ll; typedef long double ld; #define FI first #define SE second typedef pair<int, int> ii; typedef pair<ll, ll> pll; #define SZ(x) (int) x.size() #define ALL(x) x.begin(), x.end() #define pb push_back typedef vector<int> vi; typedef vector<ii> vii; typedef vector<ll> vll; typedef tuple<int, int, int> iii; typedef vector<iii> viii; #ifndef DEBUG #define cerr if (0) cerr #endif const int INF = 1000000005; const ll LINF = 1000000000000000005; const int MAXN = 200005; int n; vi vp[2][MAXN]; namespace st2 { ll count_swaps(vi s) { vi lp, rp; REP (i, 0, 2 * n) { if (s[i] < 0) { lp.pb(i); } else { rp.pb(i); } } ll ans = 0; while (!s.empty()) { int id = -1; RREP (i, SZ(s) - 2, 0) { if (abs(s[i]) == abs(s.back()) && s[i] != s.back()) { id = i; break; } } assert(id != -1); ans += SZ(s) - id - (s.back() < 0 ? 1 : 2); s.pop_back(); s.erase(s.begin() + id); } return ans; /* vi id(n); iota(ALL(id), 0); do { ll cur = 0; REP (i, 0, n) { REP (j, i + 1, n) { if (id[i] > id[j]) { cur++; } } } vector<bool> vis(n, 0); REP (i, 0, n) { REP (j, 0, n) { if (vis[j] || abs(s[lp[i]]) != abs(s[rp[j]])) { continue; } vis[j] = 1; } } } while (next_permutation(ALL(id))); */ } } namespace st3 { ll count_swaps(vi s) { int ptr = 0; ll ans = 0; REP (i, 0, 2 * n) { if (s[i] < 0) { ans += abs(i - ptr); ptr += 2; } } return ans; } } int fw[MAXN]; void incre(int i, int x) { i++; for (; i <= 2 * n; i += i & -i) { fw[i] += x; } } int qsm(int i) { i++; int res = 0; for (; i > 0; i -= i & -i) { res += fw[i]; } return res; } int qsm(int s, int e) { return qsm(e) - qsm(s - 1); } ll count_swaps(vi s) { n = SZ(s) / 2; /* bool st3 = 1; REP (i, 1, 2 * n) { if (abs(s[i]) != abs(s[i - 1])) { st3 = 0; } } bool st2 = n <= 1000; if (st2) { return st2::count_swaps(s); } else if (st3) { return st3::count_swaps(s); } ll ans = 0; REP (i, 0, n) { ans += i; } */ REP (i, 0, 2 * n) { if (s[i] < 0) { vp[0][-s[i]].pb(i); } else { vp[1][s[i]].pb(i); } } vector<bool> vis(2 * n, 0); ll ans = 0; RREP (i, 2 * n - 1, 0) { if (vis[i]) { continue; } bool b = s[i] > 0; int j = vp[b ^ 1][abs(s[i])].back(); vp[b][abs(s[i])].pop_back(); vp[b ^ 1][abs(s[i])].pop_back(); vis[i] = vis[j] = 1; int cur = i - j - b; cur -= qsm(j, i); incre(j, -1); incre(i, -1); ans += cur; } return ans; }
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