Submission #1122978

#TimeUsernameProblemLanguageResultExecution timeMemory
1122978ugaaaaaa34892374Biochips (IZhO12_biochips)C++20
100 / 100
706 ms398848 KiB
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#define i64 long long #define ld long double #define bit(n,i) ((n>>i)&1) #define pii pair<int,int> #define sz(x) (int)x.size() #define FOR(i,a,b) for(int i=a; i<=b; i++) #define FOD(i,a,b) for(int i=a; i>=b; i--) #define fi first #define se second #define pb push_back #define all(x) x.begin(),x.end() #define die_hard_onimai_fan void seggs() #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);} #define brute(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".ans","w",stdout);} #define TIME (1.0*clock()/CLOCKS_PER_SEC) #define FAST ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0); #define ai(n) array<int,n> #define dbg(x) {cerr<<#x<<' '<<x<<endl;} #define dbgArr(arr,n) {cerr<<#arr;FOR(_i,1,n)cerr<<' '<<(arr)[_i];cerr<<endl;} template <typename T,typename U> ostream& operator<<(ostream &os,pair<T,U>p){ return os<<"{"<<p.fi<<", "<<p.se<<"}"; } mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count()); i64 Rand(i64 l,i64 r) { i64 ans=l+1ll*rd()*rd()%(r-l+1); assert(l<=ans&&ans<=r); return ans; } //const i64 base=1e9+7; //const i64 mod=(1ll<<53)+5; #define i64 long long #define debug 0 //const int mod=1e9+7; //const int mod=998244353; const int inf=1e9; ///check the limits, dummy const int N=200'000 + 5; vector<int>adj[N]; int n,k; int c[N]; int dp[N][502]; int sz[N],tmp[502]; long long cnt = 0; void dfs(int u) { dp[u][0] = 0; sz[u]=1; for(int v:adj[u]) { dfs(v); FOR(i,0,k) { tmp[i] = (-1e9); } FOR(i, 1, min(sz[v], k)) tmp[i]=dp[v][i]; FOR(i, 1, min(sz[u], k)) { tmp[i]=max(tmp[i],dp[u][i]); int lim=min(sz[v],min(k,sz[u]+sz[v])-i); FOR(j,1,lim) tmp[i+j]=max(tmp[i+j],dp[u][i]+dp[v][j]), ++cnt; } swap(dp[u],tmp); sz[u]+=sz[v]; } dp[u][1]=max(dp[u][1],c[u]); } die_hard_onimai_fan { cin>>n>>k; FOR(i,1,n) { FOR(j,0,k) { dp[i][j] = (-1e9); } } int rt=-1; FOR(i,1,n) { int p; cin >> p >> c[i]; if(p != 0) adj[p].pb(i); else rt = i; } // FOR(i,1,n)for(int j:adj[i])cout<<i<<' '<<j<<'\n'; // // dbgArr(c,n); dfs(rt); if(dp[rt][k] < 0) cout << "-1\n"; else cout<<dp[rt][k]<<'\n'; } int main() { FAST file(""); int tt=1;//cin>>tt; while(tt--)seggs(); cerr<<"\nTime elapsed: "<<TIME<<" s.\n"; } /** 7 3 2 100 0 1000 2 150 3 100 3 5 5 100 2 50 */

Compilation message (stderr)

biochips.cpp: In function 'int main()':
biochips.cpp:58:53: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 | #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);}
      |                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
biochips.cpp:152:5: note: in expansion of macro 'file'
  152 |     file("");
      |     ^~~~
biochips.cpp:58:83: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 | #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);}
      |                                                                            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
biochips.cpp:152:5: note: in expansion of macro 'file'
  152 |     file("");
      |     ^~~~
#Verdict Execution timeMemoryGrader output
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