Submission #1068591

#TimeUsernameProblemLanguageResultExecution timeMemory
1068591UnforgettableplCatfish Farm (IOI22_fish)C++17
100 / 100
211 ms49732 KiB
#include "fish.h" #include <bits/stdc++.h> using namespace std; long long max_weights(int N, int M,vector<int> X,vector<int> Y, vector<int> W){ vector DP(N+1,vector(2,0ll)); vector<vector<pair<int,long long>>> pref(N+2); for(int i=0;i<=N+1;i++)pref[i].emplace_back(0,0); vector<vector<int>> special_points(N+2); for(int i=1;i<=N+1;i++)special_points[i].emplace_back(0); for(int i=1;i<=N+1;i++)special_points[i].emplace_back(N); vector transition1(2,vector(N+1,0ll)); vector transition2(3,vector(N+1,0ll)); vector transition3(3,vector(N+1,0ll)); vector transition4(2,vector(N+1,0ll)); for(int i=0;i<M;i++) { pref[X[i]+1].emplace_back(Y[i]+1,W[i]); special_points[X[i]+1].emplace_back(Y[i]); } for(int i=1;i<=N+1;i++) { sort(special_points[i].begin(),special_points[i].end()); special_points[i].erase(unique(special_points[i].begin(),special_points[i].end()),special_points[i].end()); sort(pref[i].begin(), pref[i].end()); for(int j=1;j<pref[i].size();j++)pref[i][j].second+=pref[i][j-1].second; } auto getpref = [&](int i,int j) { auto iter = lower_bound(pref[i].begin(),pref[i].end(),make_pair(j+1,-1ll)); iter--; return iter->second; }; auto get_higher = [&](int i,int j) { return lower_bound(special_points[i].begin(),special_points[i].end(),j)-special_points[i].begin()-0; }; auto get_lower = [&](int i,int j) { return upper_bound(special_points[i].begin(),special_points[i].end(),j)-special_points[i].begin()-1; }; for(int i=2;i<=N;i++) { int tot = special_points[i].size()-1; for(int s=0;s<=tot;s++) { int j = special_points[i][s]; if(i!=2)DP[s][1]=max(DP[s][1],-getpref(i,j)+transition1[0][get_higher(i-1,j)]); else DP[s][1]=max(DP[s][1],getpref(i,N)-getpref(i,j)); if(i>2) { if(i!=3) { DP[s][0]=max(DP[s][0],getpref(i-1,j)+transition2[0][get_lower(i-2,j)]); DP[s][0]=max(DP[s][0],transition3[0][get_higher(i-2,j)]); } else DP[s][0]=max(DP[s][0],getpref(i-1,N)); } if(i!=2)DP[s][0]=max(DP[s][0],getpref(i-1,j)+transition4[0][get_lower(i-1,j)]); else DP[s][0]=max(DP[s][0],getpref(i-1,j)); transition1[1][s]=getpref(i+1,j)+max(DP[s][0],DP[s][1]); transition2[2][s]=max(DP[s][0],DP[s][1]); transition3[2][s]=getpref(i+1,j)+max(DP[s][0],DP[s][1]); transition4[1][s]=-getpref(i,j)+DP[s][0]; } for(int j=tot-1;j>=0;j--)transition1[1][j]=max(transition1[1][j],transition1[1][j+1]); for(int j=1;j<=tot;j++)transition2[2][j]=max(transition2[2][j],transition2[2][j-1]); for(int j=tot-1;j>=0;j--)transition3[2][j]=max(transition3[2][j],transition3[2][j+1]); for(int j=1;j<=tot;j++)transition4[1][j]=max(transition4[1][j],transition4[1][j-1]); swap(transition1[0],transition1[1]); swap(transition2[0],transition2[1]); swap(transition2[1],transition2[2]); swap(transition3[0],transition3[1]); swap(transition3[1],transition3[2]); swap(transition4[0],transition4[1]); } long long ans = 0; for(int j=0;j<=N;j++)ans=max(ans,DP[j][0]); for(int j=0;j<=N;j++)ans=max(ans,DP[j][1]); return ans; }

Compilation message (stderr)

fish.cpp: In function 'long long int max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:25:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         for(int j=1;j<pref[i].size();j++)pref[i][j].second+=pref[i][j-1].second;
      |                     ~^~~~~~~~~~~~~~~
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