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#include "gondola.h"
#include <bits/stdc++.h>
#define pb push_back
using namespace std;
int valid(int n, int a[]){
vector<int> A, S;
for(int i = 0; i < n; i++) A.pb(a[i]);
sort(A.begin(), A.end());
for(int i = 0; i + 1 < n; i++) if(A[i] == A[i + 1]) return 0;
for(int i = 0; i < n; i++) if(a[i] <= n) S.pb((i - a[i] + n) % n);
sort(S.begin(), S.end());
for(int i = 0; i + 1 < (int) S.size(); i++) if(S[i] != S[i + 1]) return 0;
return 1;
}
//----------------------
const int MX = 250010;
int replacement(int n, int a[], int ans[]){
int L = (*max_element(a, a + n)) - n;
vector<int> mk(MX, 0);
for(int i = 0; i < n; i++)
mk[a[i]] = 1;
int idx = 0;
return L;
}
//----------------------
const long long Mod = 1e9 + 9;
int countReplacement(int n, int a[]){
if(!valid(n, a)) return 0;
vector<int> A, S;
for(int i = 0; i < n; i++) A.pb(a[i]);
sort(A.begin(), A.end());
int mx = A.back();
long long res = 1;
for(int i = n + 1; i < mx; i++){
int idx = lower_bound(A.begin(), A.end(), i) - A.begin();
if(A[idx] == i) continue;
res = (1ll * res * (n - idx)) % Mod;
}
if(n < A[0]){
res = (1ll * res * n) % Mod;
return 0;
assert(0);
}
return res;
}
/*
1
30
16 26 18 19 20 13 22 21 24 25 17 27 28 29 30 1 2 3 11 5 6 8 7 9 10 12 4 23 14 15
3
7
1 2 3 4 5 6 5
7
4
1 2 7 6
*/
컴파일 시 표준 에러 (stderr) 메시지
gondola.cpp: In function 'int replacement(int, int*, int*)':
gondola.cpp:27:6: warning: unused variable 'idx' [-Wunused-variable]
27 | int idx = 0;
| ^~~
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