Submission #856870

#	Time	Username	Problem	Language	Result	Execution time	Memory
856870		ntkphong	Gondola (IOI14_gondola)	C++14	75 / 100	16 ms	2648 KiB

gondola

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

int valid(int n, int inputSeq[]) {
    
    int k = 0;
    for(int i = 0; i < n; i ++) {
        if(inputSeq[k] > inputSeq[i]) {
            k = i;
        }        
    }
    
    if(inputSeq[k] <= n) {
        for(int i = 1; i <= n - inputSeq[k]; i ++) {
            int j = (k + i) % n;
            if(inputSeq[j] <= n && inputSeq[j] != inputSeq[k] + i) {
                return 0;
            }
        }
            
        for(int i = 1; i <= inputSeq[k] - 1; i ++) {
            int j = (k - i + n) % n;
            if(inputSeq[j] <= n && inputSeq[j] != inputSeq[k] - i) {
                return 0;
            }
        }
    }
    
    sort(inputSeq, inputSeq + n);
    
    for(int i = 0; i + 1 < n; i ++) {
        if(inputSeq[i] == inputSeq[i + 1]) {
            return 0;
        }
    }
    
    return 1;
}

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

vector<int> bld(int n, int k, int gondolaSeq[]) {
    vector<int> seq;
    seq.push_back(gondolaSeq[k]);
        
    for(int i = 1; i <= n - gondolaSeq[k]; i ++) {
        int j = (k + i) % n;
        seq.push_back(gondolaSeq[j]);
    }
        
    reverse(seq.begin(), seq.end());
        
    for(int i = 1; i <= gondolaSeq[k] - 1; i ++) {
        int j = (k - i + n) % n;
        seq.push_back(gondolaSeq[j]);
    }
        
    reverse(seq.begin(), seq.end());
    return seq;    
}

int replacement(int n, int gondolaSeq[], int replacementSeq[]) {
    int k = 0;
    for(int i = 0; i < n; i ++) {
        if(gondolaSeq[k] > gondolaSeq[i]) {
            k = i;
        }        
    }
    
    int l = 0;
    if(gondolaSeq[k] > n) {
        vector<pair<int, int>> p;
        
        for(int i = 0; i < n; i ++) {
            p.push_back({gondolaSeq[i], i + 1});
        }   
        
        sort(p.begin(), p.end());
        
        int j = n + 1;
        for(int i = 0; i < n; i ++) {
            if(p[i].first > n) { 
                replacementSeq[l ++] = p[i].second;
            }
            
            for(; j < p[i].first; j ++) {
                replacementSeq[l ++] = j;
            }
            
            if(j == p[i].first) j ++ ;
        }
    } else {
        vector<int> seq = bld(n, k, gondolaSeq);
        
        vector<pair<int, int>> p;
        
        for(int i = 0; i < n; i ++) {
            p.push_back({seq[i], i + 1});
        }   
        
        sort(p.begin(), p.end());
        
        int j = n + 1;
        for(int i = 0; i < n; i ++) {
            if(p[i].first > n) { 
                replacementSeq[l ++] = p[i].second;
            }
            
            for(; j < p[i].first; j ++) {
                replacementSeq[l ++] = j;
            }
            
            if(j == p[i].first) j ++ ;
        }
    }
    
    return l; 
}

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

const int mod = 1000000009;

int binpow(int a, int b) {
    if(!b) return 1;
    
    if(b % 2 == 0) {
        int x = binpow(a, b / 2);
        return 1LL * x * x % mod;
    }
    
    return 1LL * binpow(a, b - 1) * a % mod;
}

int countReplacement(int n, int inputSeq[]) {
    if(!valid(n, inputSeq)) return 0;

    int k = 0;
    for(int i = 0; i < n; i ++) {
        if(inputSeq[k] > inputSeq[i]) {
            k = i;
        }        
    }

    vector<int> seq;
    
    for(int i = 0; i < n; i ++) {
        if(inputSeq[i] > n) {
            seq.push_back(inputSeq[i]);
        }
    }
    
    sort(seq.begin(), seq.end());
    int curr = n;
    int total = 1;
    
    if(inputSeq[k] > n) {
        for(int i = 0; i < n; i ++) {
            total = 1LL * total * (i + 1) % mod;
        }
    }
    
    for(int i = 0; i < seq.size(); i ++) {
        total = 1LL * total * binpow((seq.size() - i), seq[i] - 1 - curr) % mod;
        curr = seq[i];
    }
    
    return total;
}

Compilation message (stderr)

gondola.cpp: In function 'int countReplacement(int, int*)':
gondola.cpp:164:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  164 |     for(int i = 0; i < seq.size(); i ++) {
      |                    ~~^~~~~~~~~~~~

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