제출 #105465

#제출 시각아이디문제언어결과실행 시간메모리
105465polyfishRoller Coaster Railroad (IOI16_railroad)C++14
34 / 100
206 ms15372 KiB
//Pantyhose(black) + glasses = infinity #include <bits/stdc++.h> using namespace std; #define debug(x) cerr << #x << " = " << x << '\n'; #define BP() cerr << "OK!\n"; #define PR(A, n) {cerr << #A << " = "; for (int _=1; _<=n; ++_) cerr << A[_] << ' '; cerr << '\n';} #define PR0(A, n) {cerr << #A << " = "; for (int _=0; _<n; ++_) cerr << A[_] << ' '; cerr << '\n';} #define FILE_NAME "data" const int64_t INF = 1e18; int n; vector<pair<int, int> > a; int64_t f[1<<16][16]; int64_t dp(int mask, int last) { if (__builtin_popcount(mask)==n) return 0; if (f[mask][last]>-1) return f[mask][last]; int64_t res = INF; for (int i=0; i<n; ++i) { if (((mask>>i) & 1)==0) { int new_mask = mask | (1<<i); // if (mask==11 && last==1 && i==2) // debug(); res = min(res, dp(new_mask, i) + max(0, a[last].second - a[i].first)); } } return f[mask][last] = res; } bool cmp(pair<int, int> l1, pair<int, int> l2) { return l1 > l2; } bool check() { vector<int> L(n); for (int i=0; i<n; ++i) L[i] = upper_bound(a.begin(), a.end(), make_pair(a[i].second, 0), cmp) - a.begin() - 1; // PR0(L, L.size()); set<int> avail; for (int i=0; i<n; ++i) avail.insert(i); int cur = n-1; avail.erase(n-1); for (int i=0; i+1<n; ++i) { // debug(cur); auto it = avail.upper_bound(L[cur]); if (it==avail.begin()) return false; --it; cur = *it; avail.erase(*it); } return true; } int64_t plan_roller_coaster(vector<int> s, vector<int> t) { n = s.size(); a.resize(n); for (int i=0; i<n; ++i) a[i] = {s[i], t[i]}; sort(a.begin(), a.end(), greater<pair<int, int> >()); if (n<=16) { memset(f, -1, sizeof(f)); // debug(dp(1, 0)); int64_t res = INF; for (int i=0; i<n; ++i) res = min(res, dp(1<<i, i)); return res; } return check(); }
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