Submission #1007510

#	Time	Username	Problem	Language	Result	Execution time	Memory
1007510		The_Samurai	Gondola (IOI14_gondola)	C++17	35 / 100	11 ms	2124 KiB

gondola

#include "gondola.h"
#include "bits/stdc++.h"
using namespace std;

int valid(int n, int a[]) {
    int last = -1;
    set<int> st;
    for (int i = 0; i < 2 * n; i++) {
        if (a[i % n] >= n) continue;
        st.insert(a[i % n]);
        if (last != -1 and (a[last % n] + i - last - 1) % n != a[i % n] - 1) return 0;
        last = i;
    }
    return st.size() == n;
}

//----------------------

const int mod = 1e9 + 9;

int replacement(int n, int a[], int replacementSeq[]) {
    const int N = 2e5 + 5;
    vector<int> owns(N, -1), old(n);
    int any = -1, last = -1;
    for (int i = 0; i < n; i++) {
        if (a[i] <= n) continue;
        owns[a[i]] = i;
        if (any == -1 or a[any] < a[i]) any = i;
    }
    for (int i = 0; i < 2 * n; i++) {
        if (a[i % n] <= n) last = i;
        if (last == -1) continue;
        old[i % n] = (a[last % n] + i - last - 1) % n + 1;
    }
    if (last == -1) {
        for (int i = 0; i < n; i++) old[i] = i + 1;
    }
    int mx = *max_element(a, a + n), z = 0;
    for (int i = n + 1; i <= mx; i++) {
        if (owns[i] != -1) {
            replacementSeq[z++] = old[owns[i]];
            old[owns[i]] = i;
        } else {
            replacementSeq[z++] = old[any];
            old[any] = i;
        }
    }
    return z;
}

//----------------------

int countReplacement(int n, int a[]) {
    if (!valid(n, a)) return 0;
    const int N = 1e6 + 5;
    vector<int> owns(N, -1);
    for (int i = 0; i < n; i++) {
        cout << a[i] << ' ';
    }
    cout << -1;
}

Compilation message (stderr)

gondola.cpp: In function 'int valid(int, int*)':
gondola.cpp:14:22: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   14 |     return st.size() == n;
      |            ~~~~~~~~~~^~~~
gondola.cpp: In function 'int countReplacement(int, int*)':
gondola.cpp:56:27: warning: control reaches end of non-void function [-Wreturn-type]
   56 |     vector<int> owns(N, -1);
      |                           ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 20 / 20
• Subtask 7: 0 / 5
• Subtask 8: 0 / 15
• Subtask 9: 0 / 15
• Subtask 10: 0 / 10