oj.uz

Submission #147220

# Submission time Handle Problem Language Result Execution time Memory
147220 2019-08-28T12:28:56 Z dolphingarlic Koala Game (APIO17_koala) C++14
29 / 100
 61 ms 504 KB 
#include "koala.h"
#include <bits/stdc++.h>
#pragma GCC Optimize("O3")
#define FOR(i, x, y) for (int i = x; i < y; i++)
#define MOD 1000000007
typedef long long ll;
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
*/
 
int minValue(int N, int W) {
    // 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
    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;
}
 
int maxValue(int N, int W) {
    // Binary search for the max value
    // Uses like 7 turns
    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];
}
 
int greaterValue(int N, int W) {
    // 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 4 turns
    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 if (R[0] > R[1]) return 0;
        else return 1;
    }
    return -1;
}
 
void allValues(int N, int W, int *P) {
    if (W == 2 * N) {
        // 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
        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.
    }
}

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:32:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (aptr < a.size() && bptr < b.size()) {
            ~~~~~^~~~~~~~~~
koala.cpp:32:36: 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 6 ms 376 KB Output is correct
2 Correct 6 ms 376 KB Output is correct
3 Correct 6 ms 376 KB Output is correct
4 Correct 6 ms 376 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 376 KB Output is correct
2 Correct 16 ms 380 KB Output is correct
3 Correct 16 ms 348 KB Output is correct
4 Correct 16 ms 504 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 61 ms 504 KB Output is correct
2 Incorrect 3 ms 376 KB Output isn't correct
3 Halted 0 ms 0 KB -

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 420 KB Output is correct
3 Correct 34 ms 420 KB Output is correct
4 Correct 35 ms 376 KB Output is correct
5 Correct 33 ms 376 KB Output is correct
6 Correct 33 ms 416 KB Output is correct
7 Correct 33 ms 376 KB Output is correct
8 Correct 34 ms 376 KB Output is correct
9 Correct 33 ms 376 KB Output is correct
10 Correct 32 ms 420 KB Output is correct
11 Correct 33 ms 376 KB Output is correct
12 Correct 20 ms 376 KB Output is correct
13 Correct 33 ms 376 KB Output is correct
14 Correct 31 ms 376 KB Output is correct
15 Correct 31 ms 376 KB Output is correct
16 Correct 30 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 31 ms 376 KB Output is correct
20 Correct 32 ms 504 KB Output is correct

Subtask #5
0 / 53.0

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