Submission #807301

#	Time	Username	Problem	Language	Result	Execution time	Memory
807301		I_Love_EliskaM_	Catfish Farm (IOI22_fish)	C++17	100 / 100	350 ms	101576 KiB

fish

#include "fish.h"
#include <bits/stdc++.h>
using namespace std;
#define forn(i,n) for(int i=0;i<n;++i)
#define pb push_back
#define all(x) x.begin(), x.end()
using ll = long long;
#define pi pair<ll,ll>
#define f first
#define s second

const int N=100005;
vector<ll> pr[N];
vector<pi> f[N];

ll sum(int i, int j) {
  int l=0, r=f[i].size();
  while (l<r) {
    int m=(l+r+1)>>1;
    if (f[i][m-1].f>j) r=m-1;
    else l=m;
  }
  return pr[i][r];
}

vector<pi> dp[N], dp2[N], dp3[N];
vector<ll> prmx[N], prmx2[N], sfmx[N];


ll prmxquery(int i, int j) {
  return prmx[i].back();
}
ll prmx2query(int i, int j) {
  int l=0, r=dp3[i].size();
  while (l<r) {
    int m=(l+r+1)>>1;
    if (dp3[i][m-1].f >= j) r=m-1;
    else l=m;
  }
  return prmx2[i][r];
}
ll sfmxquery(int i, int j) {
  return sfmx[i][0];
}

ll max_weights(int n, int m, vector<int> x, vector<int> y, vector<int> w) {

  forn(i,m) {
    f[x[i]+1].pb({y[i]+1,w[i]});
  }
  for(int i=1;i<=n;++i) {
    sort(all(f[i]));
    f[i].pb({n+1,0});
    pr[i]={0};
    forn(j,f[i].size()) pr[i].pb(pr[i].back()+f[i][j].s);
  }

  dp[0].pb({0,0});
  dp[0].pb({n,0});
  pr[0]={0,0,0};
  dp2[0]=dp3[0]=dp[0];
  prmx[0]={0,0};
  prmx2[0]=sfmx[0]=prmx[0];
  pr[n+1]={0,0,0};

  for(int i=1; i<=n; ++i) {
    if (f[i][0].f!=1) {
      int j=0;

      ll d=0;
      if (i>=2) {
        d=max(d,prmxquery(i-2,j)+sum(i-1,j));
        d=max(d,sfmxquery(i-2,j));
      }

      d=max(d,prmx2query(i-1,j)+sum(i-1,j));
      d=max(d,prmxquery(i-1,j));
      ll d3=d;
      d=max(d,sfmxquery(i-1,j)-sum(i,j));
      ll d2=d+sum(i+1,j);

      dp[i].pb({j,d});
      dp2[i].pb({j,d2});
      dp3[i].pb({j,d3});
    }
    for(auto&x:f[i]) {
      int j=x.f-1;

      ll d=0;
      if (i>=2) {
        d=max(d,prmxquery(i-2,j)+sum(i-1,j));
        d=max(d,sfmxquery(i-2,j));
      }

      d=max(d,prmx2query(i-1,j)+sum(i-1,j));
      d=max(d,prmxquery(i-1,j));
      ll d3=d;
      d=max(d,sfmxquery(i-1,j)-sum(i,j));
      ll d2=d+sum(i+1,j);

      dp[i].pb({j,d});
      dp2[i].pb({j,d2});
      dp3[i].pb({j,d3});
    }
    prmx[i]={0};
    prmx2[i]=sfmx[i]=prmx[i];

    for (int j=0; j<dp[i].size(); ++j) {
      prmx[i].pb(max(prmx[i].back(),dp[i][j].s));
      prmx2[i].pb(max(prmx2[i].back(),dp3[i][j].s-sum(i,dp3[i][j].f)));
    }
      
    reverse(all(dp2[i]));
    for (int j=0; j<dp2[i].size(); ++j) {
      sfmx[i].pb(max(sfmx[i].back(),dp2[i][j].s));
    }
    reverse(all(dp2[i]));
    reverse(all(sfmx[i]));

  }
  ll ans=0;
  for(auto&x:dp[n]) ans=max(ans,x.s);
  return ans;
  return prmx[n].back();

}

Compilation message (stderr)

fish.cpp: In function 'll max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:4:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    4 | #define forn(i,n) for(int i=0;i<n;++i)
......
   55 |     forn(j,f[i].size()) pr[i].pb(pr[i].back()+f[i][j].s);
      |          ~~~~~~~~~~~~~          
fish.cpp:55:5: note: in expansion of macro 'forn'
   55 |     forn(j,f[i].size()) pr[i].pb(pr[i].back()+f[i][j].s);
      |     ^~~~
fish.cpp:108:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  108 |     for (int j=0; j<dp[i].size(); ++j) {
      |                   ~^~~~~~~~~~~~~
fish.cpp:114:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  114 |     for (int j=0; j<dp2[i].size(); ++j) {
      |                   ~^~~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 6 / 6
• Subtask 3: 9 / 9
• Subtask 4: 14 / 14
• Subtask 5: 21 / 21
• Subtask 6: 17 / 17
• Subtask 7: 14 / 14
• Subtask 8: 16 / 16