Submission #228742

#	Time	Username	Problem	Language	Result	Execution time	Memory
228742		osaaateiasavtnl	Archery (IOI09_archery)	C++14	20 / 100	2093 ms	8284 KiB

archery

#include<bits/stdc++.h>
using namespace std;
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcount
#define ll long long
#define mp make_pair
#define f first
#define s second
#define Time (double)clock()/CLOCKS_PER_SEC
int get(vector <int> a, int x, int R) {
    if (a.size() == 2)
        return 0;
    for (int t = 0; t < R; ++t) {
        for (int i = 0; i < a.size(); i += 2) {
            if (a[i] > a[i + 1])
                swap(a[i], a[i + 1]);
        }   
        vector <int> b = a;
        b[1] = a[2];
        for (int i = 4; i < a.size(); i += 2) {
            b[i - 2] = a[i];            
        }   
        b[(int)b.size() - 2] = a[1];
 
        a = b;
    }    
    for (int i = 0; i < a.size(); ++i)
        if (a[i] == x)
            return i / 2;
}   
signed main() {
    #ifdef HOME
    freopen("input.txt", "r", stdin);
    #else
    #define endl '\n'
    ios_base::sync_with_stdio(0); cin.tie(0);
    #endif
    int n, R;
    cin >> n >> R;
 
    R %= n;
    R += 2 * n;
 
    int my;
    cin >> my;
    vector <int> p(2 * n - 1);
    for (int i = 0; i < 2 * n - 1; ++i) {
        cin >> p[i];
        if (p[i] < my)
            p[i] = 0;
        else
            p[i] = 2;
    }            
    my = 1;

    int ans = 1e9;
    int start = -1;

    vector <int> nd(2 * n);

    for (int i = 0; i < 2 * n; ++i) {
        vector <int> t = p;
        t.insert(t.begin() + i, my);
        nd[i] = get(t, my, R);
    }       
    for (int i = 0; i < 2 * n; ++i) {
        if (nd[i] <= ans) {
            ans = nd[i];
            start = i / 2;
        }   
    }   

    /*    
    for (int i = 0; i < 2 * n; ++i)
        cout << nd[i] << ' ';
    cout << endl;
    */

    #ifdef HOME
    cout << "ans : " << ans << endl;
    #endif
 
    cout << start + 1 << endl;
}

Compilation message (stderr)

archery.cpp: In function 'int get(std::vector<int>, int, int)':
archery.cpp:16:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < a.size(); i += 2) {
                         ~~^~~~~~~~~~
archery.cpp:22:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 4; i < a.size(); i += 2) {
                         ~~^~~~~~~~~~
archery.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < a.size(); ++i)
                     ~~^~~~~~~~~~
archery.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type]
 }   
 ^

• Subtask 1: 4 / 6
• Subtask 2: 16 / 94