Submission #70825

#	Time	Username	Problem	Language	Result	Execution time	Memory
70825		yusufake	Gondola (IOI14_gondola)	C++98	65 / 100	130 ms	14264 KiB

gondola

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

#define mp make_pair
#define st first
#define nd second
#define ll long long
const int mod = 1e9 + 9;
const int N   = 2e5 + 5;
pair < int , int > mn;
int T[N];
int valid(int n, int *A){
    int i;
    mn = mp(mod,0);
    map < int , int > M;
    M.clear();
    for(i=0;i<n;i++){
        mn = min(mn , mp(A[i],i));
        if(M[ A[i] ]) return 0;
        M[ A[i] ] = 1;
    }
    if(mn.st > n) return 1;
    int j = mn.nd - mn.st+1;
    if(j < 0) j += n;
    for(i=0;i<n;i++)
        if(A[i] <= n && ((j+A[i]-1 < n && j+A[i]-1 != i)||(j+A[i]-1 >= n && j+A[i]-1-n != i)) )
            return 0;
    return 1;
}

ll fast(ll a, ll b){
    ll t=1;
    for(; b ; b>>=1){
        if(b & 1) t = t*a % mod;
        a = a*a % mod;
    }
    return t;
}

int countReplacement(int n, int *A){
    if(valid(n,A) == 0) return 0;
    long long ans=1;
    int i,x,y;
    for(i=0;i<n;i++) T[i] = A[i];
    sort(T,T+n);
    for(i=n-1;i>=0;i--){
        x = T[i];
        if(x <= n) break;
        y = i && T[i-1] > n ? T[i-1] : n;
        ans = ans * fast(n-i,x-y-1) % mod;
    }
    if(i == -1) ans = ans * n % mod;
    return ans;
}

int replacement(int n, int *A, int *B){
    return 0;
    if(valid(n,A) == 0) return 0;
    countReplacement(n,A);
}

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