Submission #944179

#	Time	Username	Problem	Language	Result	Execution time	Memory
944179		Boycl07	Koala Game (APIO17_koala)	C++17	19 / 100	11 ms	2544 KiB

koala

#include "koala.h"

#include <stdio.h>
#include <stdlib.h>
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define rep(i, n) for(int i = 1; (i) <= (n); ++i)
#define forn(i, l, r) for(int i = (l); i <= (r); ++i)
#define ford(i, r, l) for(int i = (r); i >= (l); --i)
#define FOR(i, n) for(int i = 0; i < (n); ++i)
#define FORD(i, n) for(int i = ((n) - 1); i >= 0; --i)





mt19937 rng(192929);
const int MaxN = 2e5 + 3;

int b[MaxN], r[MaxN];

int minValue(int N, int W) {
    int x = rng() % N;
    FOR(i, N) b[i] = 0;
    b[x] = 1;
    playRound(b, r);
    int pos_x = 0;
    while(r[pos_x]) ++pos_x;
    if(r[x] == 2) return pos_x;
    int y = rng() % N ;
    b[x] = 0;
    b[y] = 1;
    playRound(b, r);
    int pos_y;
    while(r[pos_y]) ++pos_y;
    if(r[y] == 2) return pos_y;
    if(pos_x == pos_y) return pos_x;

    return (rng() & 1) ? pos_x : pos_y;
}

int potential[MaxN];

int maxValue(int N, int W) {
    FOR(i, N) potential[i] = 1;
    while(true)
    {
        int cnt = 0;
        FOR(i, N)
            cnt += potential[i];
        if(cnt == 1)
            FOR(i, N) if(potential[i]) return i;
        if(cnt == 0) assert(0);
        FOR(i, N)
            if(potential[i])
                b[i] = W / cnt;
            else b[i] = 0;
        playRound(b, r);

        FOR(i, N  ) if(r[i] && potential[i]) potential[i] = 1;
        else potential[i] = 0;
    }

    return 0;
}

int greaterValue(int N, int W) {
    // TODO: Implement Subtask 3 solution here.
    // You may leave this function unmodified if you are not attempting this
    // subtask.
    return 0;
}

void allValues(int N, int W, int *P) {
    if (W == 2*N) {
        // TODO: Implement Subtask 4 solution here.
        // You may leave this block unmodified if you are not attempting this
        // subtask.
    } else {
        // TODO: Implement Subtask 5 solution here.
        // You may leave this block unmodified if you are not attempting this
        // subtask.
    }
}

Compilation message (stderr)

koala.cpp: In function 'int minValue(int, int)':
koala.cpp:39:18: warning: 'pos_y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   39 |     while(r[pos_y]) ++pos_y;
      |           ~~~~~~~^

• Subtask 1: 4 / 4
• Subtask 2: 15 / 15
• Subtask 3: 0 / 18
• Subtask 4: 0 / 10
• Subtask 5: 0 / 53