Submission #629827

#	Time	Username	Problem	Language	Result	Execution time	Memory
629827		TimDee	Catfish Farm (IOI22_fish)	C++17	9 / 100	83 ms	8032 KiB

fish

#include "fish.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;


ll p2(int n, int m, vector<int> x, vector<int> y, vector<int> w) {

  vector<int> a(n,0), b(n,0);
  ll sum=0;
  for (int i=0; i<m; ++i) {
    if (x[i]==0) a[y[i]]=w[i];
    else b[y[i]]=w[i];
    sum+=w[i];
  }
  ll ans=0;
  for (int i=0; i<n; ++i) ans+=b[i];
  if (n==2) return max(ans,sum-ans);
  ll cnt=ans;
  for (int i=0; i<n; ++i) {
    cnt+=1ll*a[i]-1ll*b[i];
    ans=max(ans,cnt);
  }
  return ans;

}

ll p3(int n, int m, vector<int> x, vector<int> w) {

  vector<int> a(n,0);
  vector<pair<int,int>> b(n);
  for (int i=0; i<n; ++i) b[i]={0,i};
  for (int i=0; i<m; ++i) {
    b[x[i]]={w[i],x[i]};
    a[x[i]]=w[i];
  }
  sort(b.begin(), b.end());
  vector<int> vis(n,0);
  ll ans=0;
  for (int i=0; i<n; ++i) {
    auto it=b[i];
    int j=it.second, w=it.first; 
    
    //for (auto x:a) cout<<x<<' '; cout<<'\n';
    //for (auto x:vis) cout<<x<<' '; cout<<'\n';
    //cout<<j<<' '<<w<<'\n';
    if ((j?(vis[j-1]?0:a[j-1]):0) + ((j<n-1)?(vis[j+1]?0:a[j+1]):0) > a[j]) {
      ans+=(j?(vis[j-1]?0:a[j-1]):0) + ((j<n-1)?(vis[j+1]?0:a[j+1]):0) - a[j];
      //cout<<(j?(vis[j-1]?0:a[j-1]):0)<<' '<<((j<n-1)?(vis[j+1]?0:a[j+1]):0)<<' '<<ans<<'\n';
      a[j]=0;
      if (j) vis[j-1]=1;
      if (j<n-1) vis[j+1]=1;
    }
  }
  return ans;

}

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

  int _p1=1, _p2=1, _p3=1;
  ll sum=0;
  for (int i=0; i<m; ++i) {
    _p1&=!(x[i]&1);
    _p2&=(x[i]<=1);
    _p3&=(y[i]==0);
    sum+=w[i];
  }

  if (_p1) return sum;
  if (_p2) return p2(n,m,x,y,w);
  if (_p3) return p3(n,m,x,w);

}

Compilation message (stderr)

fish.cpp: In function 'll p3(int, int, std::vector<int>, std::vector<int>)':
fish.cpp:42:22: warning: unused variable 'w' [-Wunused-variable]
   42 |     int j=it.second, w=it.first;
      |                      ^
fish.cpp: In function 'll max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:74:1: warning: control reaches end of non-void function [-Wreturn-type]
   74 | }
      | ^

• Subtask 1: 3 / 3
• Subtask 2: 6 / 6
• Subtask 3: 0 / 9
• Subtask 4: 0 / 14
• Subtask 5: 0 / 21
• Subtask 6: 0 / 17
• Subtask 7: 0 / 14
• Subtask 8: 0 / 16