Submission #903595

#	Time	Username	Problem	Language	Result	Execution time	Memory
903595		phoebe	Parrots (IOI11_parrots)	C++17	100 / 100	9 ms	1580 KiB

encoder

#include <bits/stdc++.h>
#include "encoder.h"
#include "encoderlib.h"
using namespace std;
 
#define ll unsigned long long
 
static const int maxx = 31;
static ll idx, dp[40][32] = {0};
 
static ll _pow(ll n, ll e){
    ll re = 1ll;
    while (e){
        if (e&1) re *= n;
        n *= n;
        e >>= 1;
    }
    return re;
}

ll raw_to_hash(vector<int> &v){
    ll re = 0;
    for (int i = 0; i < v.size(); i++){
        int rem_length = v.size() - i - 1;
        ll bruh = v[i] * _pow(256, rem_length);
        re += bruh;
    }
    return re;
}
 
void dp_encode(){
    for (int x = 0; x < 32; x++) dp[0][x] = 1;
    for (int i = 1; i < 40; i++){
        for (int x = 0; x < 32; x++){
            ll re = 0;
            for (int y = x; y <= maxx; y++) re += dp[i - 1][y];
            dp[i][x] = re;
        }
    }
}

void bruh_encode(int i, ll rem, int last){
    while (i){
        for (int y = last; y <= maxx; y++){
            ll cnt = dp[i - 1][y];
            if (rem >= cnt) rem -= cnt;
            else{
                send(idx + y); 
                last = y; i--;
                break;
            }
        }
    }
}
 
void encode(int N, int M[]){
    dp_encode();
    int angie = 0;
    for (int i = 0; i < N; i += 8){
        idx = angie<<5; angie++;
        vector<int> v;
        for (int j = i; j < min(N, i + 8); j++){
            v.push_back(M[j]);
        }
        ll hash = raw_to_hash(v);
        // actually_encode(min((int)v.size() * 5, (int)38), hash, 0);
        bruh_encode(min((int)v.size() * 5, (int)38), hash, 0);
    }
}

decoder

#include <bits/stdc++.h>
#include "decoder.h"
#include "decoderlib.h"
using namespace std;
 
#define ll unsigned long long
 
static const int maxx = 31;
static ll dp[40][32] = {0};
 
static ll _pow(ll n, ll e){
    ll re = 1ll;
    while (e){
        if (e&1) re *= n;
        n *= n;
        e >>= 1;
    }
    return re;
}

ll cnt_decode(int i, int x){
    if (dp[i][x] != -1) return dp[i][x];
    if (i == 0) return 1ll;
    ll re = 0;
    for (int y = x; y <= maxx; y++) re += dp[i - 1][y];
    dp[i][x] = re;
    return re;
}
 
void dp_decode(){
    for (int x = 0; x < 32; x++) dp[0][x] = 1;
    for (int i = 1; i < 40; i++){
        for (int x = 0; x < 32; x++){
            ll re = 0;
            for (int y = x; y <= maxx; y++) re += dp[i - 1][y];
            dp[i][x] = re;
        }
    }
}

void actually_decode(int i, ll rem){
    ll angie = 0, og_rem = rem;
    for (int j = 0; j < i; j++){
        int rem_length = i - j - 1;
        ll bruh = _pow(256, rem_length);
        ll y = rem / bruh;
        output(y);
        rem %= bruh;
        angie += y * bruh;
    }
}

void decode(int N, int L, int X[]){
    dp_decode();
    sort(X, X + L); 
    for (int i = 0; i < L; i += 38){
        vector<int> v;
        for (int j = i; j < min(L, i + 38); j++){
            v.push_back(X[j] % 32);
        }
        ll hash = 0;
        ll angie = 0;
        for (int j = 0; j < v.size(); j++){
            int sz = v.size() - j - 1;
            for (int x = (j == 0 ? 0 : v[j - 1]); x < v[j]; x++){
                hash += dp[sz][x];
            }
        }
        actually_decode((v.size() + 4) / 5, hash);
    }
}

Compilation message (stderr)

encoder.cpp: In function 'long long unsigned int raw_to_hash(std::vector<int>&)':
encoder.cpp:23:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for (int i = 0; i < v.size(); i++){
      |                     ~~^~~~~~~~~~

decoder.cpp: In function 'long long unsigned int cnt_decode(int, int)':
decoder.cpp:22:18: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'int' [-Wsign-compare]
   22 |     if (dp[i][x] != -1) return dp[i][x];
      |         ~~~~~~~~~^~~~~
decoder.cpp: In function 'void actually_decode(int, long long unsigned int)':
decoder.cpp:42:19: warning: unused variable 'og_rem' [-Wunused-variable]
   42 |     ll angie = 0, og_rem = rem;
      |                   ^~~~~~
decoder.cpp: In function 'void decode(int, int, int*)':
decoder.cpp:63:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |         for (int j = 0; j < v.size(); j++){
      |                         ~~^~~~~~~~~~
decoder.cpp:62:12: warning: unused variable 'angie' [-Wunused-variable]
   62 |         ll angie = 0;
      |            ^~~~~

• Subtask 1: 17 / 17
• Subtask 2: 17 / 17
• Subtask 3: 18 / 18
• Subtask 4: 29 / 29
• Subtask 5: 19 / 19