Submission #14791

#	Time	Username	Problem	Language	Result	Execution time	Memory
14791		gs14004	Parrots (IOI11_parrots)	C++14	0 / 100	179 ms	70764 KiB

encoder

#include "encoder.h"
#include "encoderlib.h"
#include <cstring>
#include <vector>
using namespace std;

struct bignum{
    vector<short> arr;
    void init(char i){
        arr.clear();
        arr.push_back(i);
    }
};

bignum operator+(bignum a, bignum b){
    for (int i=0; i<a.arr.size(); i++) {
        a.arr[i] += b.arr[i];
        if(a.arr[i] >= 256) {
            a.arr[i] -= 256;
            if(i + 1 == a.arr.size()) a.arr.push_back(0);
            a.arr[i+1] ++;
        }
    }
    for (int i=a.arr.size(); i<b.arr.size(); i++) {
        a.arr.push_back(b.arr[i]);
    }
    return a;
}

bool operator<(bignum a, bignum b){
    if(a.arr.size() != b.arr.size()) return a.arr.size() < b.arr.size();
    for (int i=a.arr.size(); i>=0; i--) {
        if(a.arr[i] < b.arr[i]) return 1;
        if(a.arr[i] > b.arr[i]) return 0;
    }
    return 0;
}

bignum bino[600][600];

void encode(int N, int* M){
    for (int i=0; i<600; i++) {
        bino[i][0].init(1);
        for (int j=1; j<=i; j++) {
            bino[i][j] = bino[i-1][j] + bino[i-1][j-1];
        }
        for (int j=i+1; j<600; j++) {
            bino[i][j].init(0);
        }
    }
    bignum base, t;
    t.init(0);
    for (int i=0; i<N; i++) {
        t.arr[i] = M[i];
    }
    base.init(0);
    t = t + base;
    base.init(0);
    int length = 255 + 5 * N;
    for(int i=0; i<5*N; i++){
        while (t < bino[length-1][5 * N - i] + base) {
            length--;
        }
        send(5 * N + 255 - length - i - 1);
        base = base + bino[length-1][5 * N - i];
        length--;
    }
}

decoder

#include "decoder.h"
#include "decoderlib.h"
#include <algorithm>
#include <cstring>
#include <vector>
using namespace std;
 
struct bignum{
    vector<short> arr;
    void init(char i){
        arr.clear();
        arr.push_back(i);
    }
};
 
bignum operator+(bignum a, bignum b){
    for (int i=0; i<a.arr.size(); i++) {
        a.arr[i] += b.arr[i];
        if(a.arr[i] >= 256) {
            a.arr[i] -= 256;
            if(i + 1 == a.arr.size()) a.arr.push_back(0);
            a.arr[i+1] ++;
        }
    }
    for (int i=a.arr.size(); i<b.arr.size(); i++) {
        a.arr.push_back(b.arr[i]);
    }
    return a;
}
 
bool operator<(bignum a, bignum b){
    if(a.arr.size() != b.arr.size()) return a.arr.size() < b.arr.size();
    for (int i=a.arr.size(); i>=0; i--) {
        if(a.arr[i] < b.arr[i]) return 1;
        if(a.arr[i] > b.arr[i]) return 0;
    }
    return 0;
}
 
bignum bino[600][600];
 
void decode(int N, int L, int X[])
{
    for (int i=0; i<600; i++) {
        bino[i][0].init(1);
        for (int j=1; j<=i; j++) {
            bino[i][j].init(0);
            bino[i][j] = bino[i-1][j] + bino[i-1][j-1];
        }
        for (int j=i+1; j<600; j++) {
            bino[i][j].init(0);
        }
    }
    sort(X,X+L);
    bignum ret;
    ret.init(0);
    for (int i=0; i<L; i++) {
        ret = ret + bino[5 * N + 255 - X[i] - i - 2][5 * N - i];
    }
    while(ret.arr.size() < N)ret.arr.push_back(0);
    for (int i=0; i<N; i++) {
        output(ret.arr[i]);
    }
}

Compilation message (stderr)

encoder.cpp: In function 'bignum operator+(bignum, bignum)':
encoder.cpp:16:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0; i<a.arr.size(); i++) {
                   ~^~~~~~~~~~~~~
encoder.cpp:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(i + 1 == a.arr.size()) a.arr.push_back(0);
                ~~~~~~^~~~~~~~~~~~~~~
encoder.cpp:24:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=a.arr.size(); i<b.arr.size(); i++) {
                              ~^~~~~~~~~~~~~

decoder.cpp: In function 'bignum operator+(bignum, bignum)':
decoder.cpp:17:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0; i<a.arr.size(); i++) {
                   ~^~~~~~~~~~~~~
decoder.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(i + 1 == a.arr.size()) a.arr.push_back(0);
                ~~~~~~^~~~~~~~~~~~~~~
decoder.cpp:25:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=a.arr.size(); i<b.arr.size(); i++) {
                              ~^~~~~~~~~~~~~
decoder.cpp: In function 'void decode(int, int, int*)':
decoder.cpp:60:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(ret.arr.size() < N)ret.arr.push_back(0);
           ~~~~~~~~~~~~~~~^~~

• Subtask 1: 0 / 17
• Subtask 2: 0 / 17
• Subtask 3: 0 / 18
• Subtask 4: 0 / 29
• Subtask 5: 0 / 19