oj.uz

Submission #147240

# Submission time Handle Problem Language Result Execution time Memory
147240 2019-08-28T13:29:53 Z dolphingarlic Koala Game (APIO17_koala) C++14
47 / 100
 69 ms 760 KB 
#include "koala.h"
#include <bits/stdc++.h>
#pragma GCC Optimize("O3")
#define FOR(i, x, y) for (int i = x; i < y; i++)
using namespace std;

int B[100], R[100];

/*
HELPER FUNCTIONS
*/

bool compare(int a, int b, int N, int W) {
    fill(B, B + N, 0);
    B[a] = B[b] = W;
    playRound(B, R);
    return (R[b] > W);
}
vector<int> mergesort(vector<int> v, int N, int W) {
    if (v.size() == 1) return v;
 
    vector<int> a, b;
    a.insert(a.begin(), v.begin(), v.begin() + (v.size() + 1) / 2);
    b.insert(b.begin(), v.begin() + (v.size() + 1) / 2, v.end());
    a = mergesort(a, N, W), b = mergesort(b, N, W);
 
    vector<int> sorted;
    int aptr = 0, bptr = 0;
    while (aptr < a.size() && bptr < b.size()) {
        if (compare(a[aptr], b[bptr], N, W)) sorted.push_back(a[aptr++]);
        else sorted.push_back(b[bptr++]);
    }
    sorted.insert(sorted.end(), a.begin() + aptr, a.end());
    sorted.insert(sorted.end(), b.begin() + bptr, b.end());
 
    return sorted;
}

/*
BEGIN ACTUAL FUNCTIONS
*/

// Assign a single stone to the first cup
// If Koala picks that cup, it is not the smallest and some other cup has 0
// Otherwise, cup 0 is the smallest cup
// Uses 1 turn
int minValue(int N, int W) {
    fill(B, B + N, 0);
    fill(R, R + N, 0);
    B[0] = 1;
    playRound(B, R);
    if (R[0] < 2) return 0;
    else FOR(i, 1, N) if (!R[i]) return i;
    return -1;
}

// Binary search for the max value
// Uses like 4 turns
int maxValue(int N, int W) {
    vector<int> v;
    FOR(i, 0, N) v.push_back(i);
    while (v.size() != 1) {
        int k = W / v.size();
        fill(B, B + N, 0);
        for (int i : v) B[i] = k;
        playRound(B, R);
        v.clear();
        FOR(i, 0, N)
        if (R[i] > k) v.push_back(i);
    }
    return v[0];
}

// Assign positions 0 and 1 x stones until Koala treats them differently
// Binary search for x:
// If both 0 and 1 get > x stones, increase x
// If both 0 and 1 get < x stones, decrease x
// Notice how x <= 9 because sum(9..17) > 100
// Uses like 3 turns
int greaterValue(int N, int W) {
    int l = 1, r = 9;
    while (l != r) {
        int mid = (l + r) / 2;
        B[0] = B[1] = mid;
        playRound(B, R);

        if (R[0] > mid && R[1] > mid) l = mid + 1;
        else if (R[0] <= mid && R[1] <= mid) r = mid - 1;
        else return (R[0] < R[1]);
    }
    B[0] = B[1] = l;
    playRound(B, R);
    return (R[0] < R[1]);
}

// Subtask 4:
// Assign indices i and j 100 stones each to check whether P[i] > P[j]
// Use merge sort to get O(Nlog(N)) <= 700 turns
// Subtask 5:
// TODO
void allValues(int N, int W, int *P) {
    if (W == 2 * N) {
        vector<int> v;
        FOR(i, 0, N) v.push_back(i);
        vector<int> sorted = mergesort(v, N, W / 2);
        FOR(i, 0, N) P[sorted[i]] = i + 1;
    } else {
        // TODO: Implement Subtask 5 solution here.
        // You may leave this block unmodified if you are not attempting this
        // subtask.
        vector<int> v;
        FOR(i, 0, N) v.push_back(i);
        vector<int> sorted = mergesort(v, N, W / 2);
        FOR(i, 0, N) P[sorted[i]] = i + 1;
    }
}

Compilation message

koala.cpp:3:0: warning: ignoring #pragma GCC Optimize [-Wunknown-pragmas]
 #pragma GCC Optimize("O3")
 
koala.cpp: In function 'std::vector<int> mergesort(std::vector<int>, int, int)':
koala.cpp:29:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (aptr < a.size() && bptr < b.size()) {
            ~~~~~^~~~~~~~~~
koala.cpp:29:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (aptr < a.size() && bptr < b.size()) {
                               ~~~~~^~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 376 KB Output is correct
2 Correct 6 ms 376 KB Output is correct
3 Correct 11 ms 376 KB Output is correct
4 Correct 7 ms 376 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 376 KB Output is correct
2 Correct 16 ms 376 KB Output is correct
3 Correct 16 ms 452 KB Output is correct
4 Correct 16 ms 448 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 61 ms 504 KB Output is correct
2 Correct 69 ms 432 KB Output is correct
3 Correct 62 ms 760 KB Output is correct
4 Correct 59 ms 760 KB Output is correct
5 Correct 60 ms 760 KB Output is correct
6 Correct 64 ms 760 KB Output is correct
7 Correct 60 ms 760 KB Output is correct
8 Correct 61 ms 636 KB Output is correct
9 Correct 60 ms 632 KB Output is correct
10 Correct 59 ms 632 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 376 KB Output is correct
2 Correct 35 ms 376 KB Output is correct
3 Correct 35 ms 376 KB Output is correct
4 Correct 35 ms 384 KB Output is correct
5 Correct 34 ms 376 KB Output is correct
6 Correct 35 ms 376 KB Output is correct
7 Correct 34 ms 376 KB Output is correct
8 Correct 33 ms 504 KB Output is correct
9 Correct 33 ms 376 KB Output is correct
10 Correct 33 ms 504 KB Output is correct
11 Correct 34 ms 376 KB Output is correct
12 Correct 21 ms 376 KB Output is correct
13 Correct 34 ms 376 KB Output is correct
14 Correct 31 ms 376 KB Output is correct
15 Correct 31 ms 384 KB Output is correct
16 Correct 29 ms 376 KB Output is correct
17 Correct 30 ms 376 KB Output is correct
18 Correct 31 ms 376 KB Output is correct
19 Correct 30 ms 376 KB Output is correct
20 Correct 30 ms 376 KB Output is correct

Subtask #5
0 / 53.0

# Verdict Execution time Memory Grader output
1 Incorrect 12 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -