Submission #919343

#	Time	Username	Problem	Language	Result	Execution time	Memory
919343		vnm06	Koala Game (APIO17_koala)	C++14	100 / 100	45 ms	720 KiB

koala

#include<bits/stdc++.h>
#include "koala.h"
using namespace std;

int minValue(int N, int W) {
    int B[105], R[105];
    for(int i=0; i<N; i++) B[i]=R[i]=0;
    B[0]=1;
    playRound(B, R);
    for(int i=1; i<N; i++) if(!R[i]) return i;
    return 0;
}

int maxValue(int N, int W) {
    vector<int> pos, pos2;
    pos.resize(N);
    for(int i=0; i<N; i++) pos[i]=i;
    int B[105], R[105];
    for(int i=0; i<N; i++) B[i]=R[i]=0;

    while(pos.size()>1)
    {
        int k=pos.size(), v=W/k;
        for(int i=0; i<N; i++) B[i]=R[i]=0;
        for(int i=0; i<k; i++) B[pos[i]]=v;
        playRound(B, R);
        pos2.resize(0);
        for(int i=0; i<k; i++)
        {
            if(R[pos[i]]>B[pos[i]]) pos2.push_back(pos[i]);
        }
        pos.resize(pos2.size());
        for(int i=0; i<pos.size(); i++) pos[i]=pos2[i];
    }
    // TODO: Implement Subtask 2 solution here.
    // You may leave this function unmodified if you are not attempting this
    // subtask.
    return pos[0];
}

int greaterValue(int N, int W) {
    int B[105], R[105];
    for(int i=0; i<N; i++) B[i]=R[i]=0;
    int le=0, ri=13;
    while(ri-le>1)
    {
        int mid=(le+ri)/2;
        B[0]=B[1]=mid;
        playRound(B, R);
        if(R[0]<=B[0] && R[1]<=B[1]) ri=mid;
        else if(R[0]>B[1] && R[1]>B[1]) le=mid;
        else return R[0]<R[1];
    }
    // TODO: Implement Subtask 3 solution here.
    // You may leave this function unmodified if you are not attempting this
    // subtask.
    return 0;
}

int find_V(int N, int br, int W)
{
    ///cout<<N<<" "<<br<<" "<<W<<endl;
    for(int i=1; i<=W/br; i++)
    {
        int best=0, brbst=0;
        for(int j=0; j<=br; j++)
        {
            if(j*(i+1)>W) continue;
            int brost=W-j*(i+1);
            if(brost>N-br) brost=N-br;
            int tval=(2*N-j+1)*j/2;
            tval+=(2*(N-br)-brost+1)*brost/2;
            if(tval>best) {best=tval; brbst=j;}
        }
        ///cout<<i<<' '<<best<<" "<<brbst<<endl;
        if(brbst<br) return i;
    }
}

void allValues(int N, int W, int *P)
{
    int B[105], R[105];
    for(int i=0; i<N; i++) B[i]=R[i]=0;

    int ord[105];
    int gr[105];

    for(int i=0; i<N; i++)
    {
        ord[i]=i;
        gr[i]=0;
    }
    while(1)
    {
        int i;
        for(i=0; i<N-1; i++)
        {
            ///cout<<gr[i]<<" ";
            if(!gr[i]) break;
        }
        ///for(int i=0; i<N; i++) cout<<ord[i]<<" ";
        ///cout<<endl;
        if(i==N-1) break;
        int le=i;
        int ri=i;
        while(ri+1<N-1 && !gr[ri+1]) ri++;
        ri++;

        int br=ri-le+1;

        int v=find_V(N-le, br, W-le);
        ///cout<<v<<endl;
        for(int i=0; i<N; i++) B[i]=0;
        for(int j=le; j<=ri; j++) B[ord[j]]=v;
        playRound(B, R);

        for(int j=le; j<=ri; j++)
        {
            if(B[ord[j]]<R[ord[j]])
            {
               /// cout<<j<<" "<<le<<endl;
                swap(ord[j], ord[le]);
                le++;
            }
        }
        gr[le-1]=1;
       /// cout<<lst<<"Smqna"<<" "<<le-1<<endl;
    }
    for(int i=0; i<N; i++) P[ord[i]]=N-i;
}

Compilation message (stderr)

koala.cpp: In function 'int maxValue(int, int)':
koala.cpp:33:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |         for(int i=0; i<pos.size(); i++) pos[i]=pos2[i];
      |                      ~^~~~~~~~~~~
koala.cpp: In function 'int find_V(int, int, int)':
koala.cpp:78:1: warning: control reaches end of non-void function [-Wreturn-type]
   78 | }
      | ^

• Subtask 1: 4 / 4
• Subtask 2: 15 / 15
• Subtask 3: 18 / 18
• Subtask 4: 10 / 10
• Subtask 5: 53 / 53