제출 #895729

#제출 시각아이디문제언어결과실행 시간메모리
895729Neco_arcLongest beautiful sequence (IZhO17_subsequence)C++17
100 / 100
4950 ms89388 KiB
#include <bits/stdc++.h> #define ll long long #define ull unsigned long long #define all(x) x.begin(), x.end() #define VietAnh "Longest beautiful sequence" #define resp(x) sort(all(x)), x.resize(unique(all(x)) - x.begin()) #define getbit(x,i) ((x >> i)&1) #define _left id * 2, l, mid #define _right id * 2 + 1, mid + 1, r #define cntbit(x) __builtin_popcountll(x) #define fi(i, a, b) for(int i = a; i <= b; i++) #define fid(i, a, b) for(int i = a; i >= b; i--) #define maxn (int) 1e5 + 7 using namespace std; const ll mod = 1e9 + 7; mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count()); ll GetRandom(ll l, ll r) { return uniform_int_distribution<ll> (l, r)(rng); } int n; int dp[maxn], a[maxn]; int L[(1 << 10) + 1][(1 << 10) + 1][21]; int p[maxn]; void Trace_Back(int id) { vector<int> ans = {id}; int pre = id; fid(i, id - 1, 1) { if(cntbit(a[i] & a[pre]) == p[pre] && (dp[i] == dp[pre] - 1)){ ans.push_back(i); pre = i; } } reverse(all(ans)); for(int x : ans) cout << x << " "; } void sub1() { int ans = 0; fi(i, 1, n) { dp[i] = 1; fid(j, i - 1, 1) { if(cntbit(a[i] & a[j]) == p[i]) dp[i] = max(dp[i], dp[j] + 1); } ans = max(ans, dp[i]); } cout << ans << '\n'; fi(i, 1, n) if(dp[i] == ans) { Trace_Back(i); return; } } tuple<int, int> dcm(int x) { int l = 0, r = 0; fi(i, 1, 10) if(getbit(x, i - 1)) l |= (1 << (i - 1)); fi(i, 11, 20) if(getbit(x, i - 1)) r |= (1 << (i - 10 - 1)); return {l, r}; } void sub2() { int ans = 0; fi(i, 1, n) { dp[i] = 1; int Left, Right; tie(Left, Right) = dcm(a[i]); fi(l, 0, (1 << 10) - 1) dp[i] = max(dp[i], L[l][Right][p[i] - cntbit(l & Left)] + 1); fi(r, 0, (1 << 10) - 1) L[Left][r][cntbit(r & Right)] = max(L[Left][r][cntbit(r & Right)], dp[i]); ans = max(ans, dp[i]); } // cout << '\n'; // cout << ans << '\n'; fi(i, 1, n) if(dp[i] == ans) { Trace_Back(i); return; } } void solve() { cin >> n; // fi(i, 1, n) cin >> a[i]; fi(i, 1, n) cin >> p[i]; sub2(); } int main() { ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0); if(fopen(VietAnh".inp", "r")) { freopen(VietAnh".inp", "r", stdin); freopen(VietAnh".out", "w", stdout); } int nTest = 1; // cin >> nTest; while(nTest--) { solve(); } return 0; }

컴파일 시 표준 에러 (stderr) 메시지

subsequence.cpp: In function 'std::tuple<int, int> dcm(int)':
subsequence.cpp:72:33: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   72 |     fi(i, 1, 10) if(getbit(x, i - 1)) l |= (1 << (i - 1));
      |                               ~~^~~
subsequence.cpp:8:28: note: in definition of macro 'getbit'
    8 | #define getbit(x,i) ((x >> i)&1)
      |                            ^
subsequence.cpp:73:34: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   73 |     fi(i, 11, 20) if(getbit(x, i - 1)) r |= (1 << (i - 10 - 1));
      |                                ~~^~~
subsequence.cpp:8:28: note: in definition of macro 'getbit'
    8 | #define getbit(x,i) ((x >> i)&1)
      |                            ^
subsequence.cpp: In function 'int main()':
subsequence.cpp:124:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  124 |         freopen(VietAnh".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
subsequence.cpp:125:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  125 |         freopen(VietAnh".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
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