제출 #445257

#제출 시각아이디문제언어결과실행 시간메모리
445257cpp219Ball Machine (BOI13_ballmachine)C++14
41.92 / 100
422 ms24812 KiB
#pragma GCC optimization O2 #pragma GCC optimization "unroll-loop" #pragma target ("avx2") #include <bits/stdc++.h> #define ll int #define ld long double #define fs first #define sc second using namespace std; typedef pair<ll,ll> LL; const ll N = 1e5 + 9; const ll Log2 = 20; const ll inf = 1e18 + 7; priority_queue<LL,vector<LL>,greater<LL>> pq; vector<ll> g[N]; ll n,Q,root,x,mn[N],par[N][Log2],d[N],last,type,take[N],pos[N]; ll nTime = 1; void DFS(ll u){ for (ll i = 1;i < Log2;i++) if ((1 << i) <= d[u]) par[u][i] = par[par[u][i - 1]][i - 1]; mn[u] = u; for (auto i : g[u]){ par[i][0] = u; d[i] = d[u] + 1; DFS(i); mn[u] = min(mn[u],mn[i]); } } bool lf(ll x,ll y){ return mn[x] < mn[y]; } void geiDFS(ll u){ sort(g[u].begin(),g[u].end(),lf); for (auto i : g[u]) geiDFS(i); pos[u] = nTime; nTime++; } ll Jump(ll node,ll step){ for (ll i = Log2 - 1;i >= 0;i--){ if (step >= (1 << i)){ node = par[node][i]; step -= (1 << i); } } return node; } int main(){ ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0); #define task "tst" if (fopen(task".INP","r")){ freopen(task".INP","r",stdin); //freopen(task".OUT","w",stdout); } cin>>n>>Q; for (ll i = 1;i <= n;i++){ cin>>x; if (x == 0) root = i; else g[x].push_back(i); } DFS(root); geiDFS(root); for (ll i = 1;i <= n;i++) pq.push({pos[i],i}); while(Q--){ cin>>type>>x; if (type == 1){ while(x--){ LL t = pq.top(); pq.pop(); last = t.sc; take[t.sc] = 1; } cout<<last<<"\n"; } else{ ll l,m,h; l = 0; h = d[x]; while(l <= h){ m = (l + h)/2; ll nxt = Jump(x,m); if (!take[nxt]) h = m - 1; else l = m + 1; } ll cur = Jump(x,h); last = cur; cout<<h<<"\n"; take[cur] = 0; } } }

컴파일 시 표준 에러 (stderr) 메시지

ballmachine.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    1 | #pragma GCC optimization O2
      | 
ballmachine.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
ballmachine.cpp:3: warning: ignoring '#pragma target ' [-Wunknown-pragmas]
    3 | #pragma target ("avx2")
      | 
ballmachine.cpp:14:21: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
   14 | const ll inf = 1e18 + 7;
      |                ~~~~~^~~
ballmachine.cpp: In function 'int main()':
ballmachine.cpp:54:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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