Submission #422966

#TimeUsernameProblemLanguageResultExecution timeMemory
422966cgiosySalesman (IOI09_salesman)C++17
100 / 100
466 ms31600 KiB
#include <bits/stdc++.h> using namespace std; constexpr int M=500002; struct pii { int x, v; bool operator<(pii b) const { return x<b.x; } }; int main() { ios::sync_with_stdio(0);cin.tie(0); int N, L, R, st; cin>>N>>L>>R>>st; vector<pii> A[M]; for(int i=0; i<N; i++) { int t, x, v; cin>>t>>x>>v; A[t].push_back({x, v}); } auto set=[&](int* T, int i, int x) { for(; i<M; i+=i&-i) T[i]=max(T[i], x); }; auto qry=[&](int* T, int i) { int x=-2e9; for(; i; i-=i&-i) x=max(x, T[i]); return x; }; int T1[M], T2[M]; fill(T1, T1+M, -2e9); fill(T2, T2+M, -2e9); set(T1, st, st*R); set(T2, M-st, -st*L); for(auto&X:A) if(int n=X.size()) { sort(X.begin(), X.end()); int D[n], E[n]; for(int i=0, m=-2e9; i<n; i++) { auto[x,v]=X[i]; D[i]=max(qry(T1, x)-x*R, qry(T2, M-x)+x*L)+v; E[i]=m=max(m+v, D[i]+x*R); } for(int i=n-1, m=-2e9; i>=0; i--) { auto[x,v]=X[i]; m=max(m+v, D[i]-x*L); int t=max(m+x*L, E[i]-x*R); set(T1, x, t+x*R); set(T2, M-x, t-x*L); } } cout<<max(qry(T1, st)-st*R, qry(T2, M-st)+st*L)<<'\n'; }
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