Submission #1082666

#TimeUsernameProblemLanguageResultExecution timeMemory
1082666hahahahaElection Campaign (JOI15_election_campaign)C++14
100 / 100
148 ms39508 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 __sumairu__ main() #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=2e5+5; i64 bit[N]; i64 get(int i) { i64 ans=0; for(++i;i>0;i-=i&-i)ans+=bit[i]; return ans; } i64 get(int l,int r) { return get(r)-get(l-1); } void add(int i,i64 v) { for(++i;i<N;i+=i&-i)bit[i]+=v; } int n; vector<int>adj[N],vec[N]; ai(3) a[N]; int in[N],out[N],timer=-1; int h[N],f[N][20]; void dfs(int u,int p=0) { h[u]=h[p]+1; in[u]=++timer; for(int v:adj[u])if(v!=p) { f[v][0]=u; FOR(i,1,19)f[v][i]=f[f[v][i-1]][i-1]; dfs(v,u); } out[u]=++timer; } int lca(int u,int v) { if(h[u]<h[v])swap(u,v); FOD(i,__lg(h[u]-h[v]),0)if(h[f[u][i]]>=h[v]) { u=f[u][i]; } if(u==v)return u; FOD(i,__lg(h[u]),0)if(f[u][i]!=f[v][i]) { u=f[u][i],v=f[v][i]; } return f[u][0]; } i64 dp[N],s[N]; void dfs2(int u,int p=0) { for(int v:adj[u])if(v!=p) { dfs2(v,u); s[u]+=dp[v]; } dp[u]=s[u]; for(int id:vec[u]) { auto [x,y,w]=a[id]; dp[u]=max(dp[u],get(in[x])+get(in[y])+s[u]+w); } add(in[u],s[u]-dp[u]); add(out[u],dp[u]-s[u]); } die_hard_onimai_fan { cin>>n; FOR(i,2,n) { int u,v; cin>>u>>v; adj[u].pb(v); adj[v].pb(u); } dfs(1); int m; cin>>m; FOR(i,1,m) { int u,v,w; cin>>u>>v>>w; int p=lca(u,v); vec[p].pb(i); a[i]={u,v,w}; } dfs2(1); cout<<dp[1]; } __sumairu__ { FAST file(""); int tt=1;//cin>>tt; while(tt--)seggs(); cerr<<"\nTime elapsed: "<<TIME<<" s.\n"; } /** 7 3 4 6 5 2 7 1 5 7 5 4 5 5 4 3 10 5 6 5 2 6 9 7 2 2 1 3 8 */

Compilation message (stderr)

election_campaign.cpp: In function 'void dfs2(int, int)':
election_campaign.cpp:153:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  153 |         auto [x,y,w]=a[id];
      |              ^
election_campaign.cpp: At global scope:
election_campaign.cpp:57:21: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   57 | #define __sumairu__ main()
      |                     ^~~~
election_campaign.cpp:187:1: note: in expansion of macro '__sumairu__'
  187 | __sumairu__
      | ^~~~~~~~~~~
election_campaign.cpp: In function 'int main()':
election_campaign.cpp:59:53: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 | #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);}
      |                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
election_campaign.cpp:190:5: note: in expansion of macro 'file'
  190 |     file("");
      |     ^~~~
election_campaign.cpp:59:83: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 | #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);}
      |                                                                            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
election_campaign.cpp:190:5: note: in expansion of macro 'file'
  190 |     file("");
      |     ^~~~
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