Skip to content

Commit 80da386

Browse files
mtnshhmtnshh
committed
renaming files
1 parent 30b8782 commit 80da386

10 files changed

+1316
-0
lines changed

‎arithmetic_decode.cpp

+127
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,127 @@
1+
#include <bits/stdc++.h>
2+
3+
using namespace std;
4+
5+
#define ll long long
6+
7+
const ll MIN = 0;
8+
const ll MAX = 65535;
9+
10+
int lower[257];
11+
12+
#define err() cout<<"=================================="<<endl;
13+
#define errA(A) for(auto i:A) cout<<i<<" ";cout<<endl;
14+
#define err1(a) cout<<#a<<" "<<a<<endl
15+
#define err2(a,b) cout<<#a<<" "<<a<<" "<<#b<<" "<<b<<endl
16+
#define err3(a,b,c) cout<<#a<<" "<<a<<" "<<#b<<" "<<b<<" "<<#c<<" "<<c<<endl
17+
#define err4(a,b,c,d) cout<<#a<<" "<<a<<" "<<#b<<" "<<b<<" "<<#c<<" "<<c<<" "<<#d<<" "<<d<<endl
18+
19+
string write_bits(bool bit, int bit_to_fall){
20+
string tmp;
21+
tmp += to_string(bit);
22+
while(bit_to_fall){
23+
tmp += to_string(!bit);
24+
bit_to_fall -= 1;
25+
}
26+
return tmp;
27+
}
28+
29+
int to_int(int _pos, string &encode){
30+
int n = 0;
31+
for (int i = _pos; i < sizeof(short) * 8 + _pos; i++)
32+
{
33+
n <<= 1;
34+
n |= encode[i] - '0';
35+
}
36+
return n;
37+
}
38+
39+
ll add_bit(ll value, int count_taken, bool &flag, string &encode){
40+
bitset<16> a(value);
41+
42+
if(flag == 1){
43+
a.reset(0);
44+
}
45+
else if(count_taken > encode.length()){
46+
a.set(0);
47+
flag = 1;
48+
}
49+
else if(encode[count_taken] == '1'){
50+
a.set(0);
51+
}
52+
else if(encode[count_taken] == '0'){
53+
a.reset(0);
54+
}
55+
56+
value = (ll)(a.to_ulong());
57+
return value;
58+
}
59+
60+
int main(){
61+
62+
const ll ONE_QTR = MAX / 4 + 1;
63+
const ll HALF = 2 * ONE_QTR;
64+
const ll THREE_QTR = 3 * ONE_QTR;
65+
66+
ll len;
67+
string code;
68+
69+
cin >> len;
70+
for(int i=0; i<=256; i++) cin >> lower[i];
71+
cin >> code;
72+
73+
string decode = "";
74+
75+
ll _low[len];
76+
ll _high[len];
77+
78+
_low[0] = MIN;
79+
_high[0] = MAX;
80+
81+
ll value = to_int(0, code);
82+
int count_taken = 16;
83+
bool flag = 0;
84+
85+
for(int i=1;i<len;i++){
86+
ll range = (_high[i-1] - _low[i-1] + 1);
87+
ll nxt = (((value - _low[i-1]) + 1) * len - 1) / range;
88+
89+
int symbol;
90+
for(symbol = 1; lower[symbol] <= nxt; symbol++);
91+
92+
_low[i] = _low[i-1] + (range * lower[symbol-1]) / len;
93+
_high[i] = _low[i-1] + (range * lower[symbol]) / len - 1;
94+
95+
if(symbol == 256)
96+
break;
97+
98+
decode += char(symbol);
99+
100+
for(;;){
101+
if(_high[i] >= HALF){
102+
if(_low[i] >= HALF){
103+
value -= HALF;
104+
_low[i] -= HALF;
105+
_high[i] -= HALF;
106+
}
107+
else if (_low[i] >= ONE_QTR && _high[i] < THREE_QTR)
108+
{
109+
value -= ONE_QTR;
110+
_low[i] -= ONE_QTR;
111+
_high[i] -= ONE_QTR;
112+
}
113+
else
114+
{
115+
break;
116+
}
117+
}
118+
_low[i] = 2 * _low[i];
119+
_high[i] = 2 * _high[i] + 1;
120+
value = add_bit(2 * value, count_taken, flag, code);
121+
count_taken++;
122+
}
123+
}
124+
125+
cout << decode << endl;
126+
127+
}

‎arithmetic_encode.cpp

+136
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,136 @@
1+
#include <bits/stdc++.h>
2+
3+
using namespace std;
4+
5+
#define ll long long
6+
7+
const ll MIN = 0;
8+
const ll MAX = 65535;
9+
10+
int lower[257];
11+
12+
#define err() cout<<"=================================="<<endl;
13+
#define errA(A) for(auto i:A) cout<<i<<" ";cout<<endl;
14+
#define err1(a) cout<<#a<<" "<<a<<endl
15+
#define err2(a,b) cout<<#a<<" "<<a<<" "<<#b<<" "<<b<<endl
16+
#define err3(a,b,c) cout<<#a<<" "<<a<<" "<<#b<<" "<<b<<" "<<#c<<" "<<c<<endl
17+
#define err4(a,b,c,d) cout<<#a<<" "<<a<<" "<<#b<<" "<<b<<" "<<#c<<" "<<c<<" "<<#d<<" "<<d<<endl
18+
19+
string write_bits(bool bit, int bit_to_fall){
20+
string tmp;
21+
tmp += to_string(bit);
22+
while(bit_to_fall){
23+
tmp += to_string(!bit);
24+
bit_to_fall -= 1;
25+
}
26+
return tmp;
27+
}
28+
29+
int to_int(int _pos, string &encode){
30+
int n = 0;
31+
for (int i = _pos; i < sizeof(short) * 8 + _pos; i++)
32+
{
33+
n <<= 1;
34+
n |= encode[i] - '0';
35+
}
36+
return n;
37+
}
38+
39+
ll add_bit(ll value, int count_taken, bool &flag, string &encode){
40+
bitset<16> a(value);
41+
42+
if(flag == 1){
43+
a.reset(0);
44+
}
45+
else if(count_taken > encode.length()){
46+
a.set(0);
47+
flag = 1;
48+
}
49+
else if(encode[count_taken] == '1'){
50+
a.set(0);
51+
}
52+
else if(encode[count_taken] == '0'){
53+
a.reset(0);
54+
}
55+
56+
value = (ll)(a.to_ulong());
57+
return value;
58+
}
59+
60+
int main(){
61+
62+
const ll ONE_QTR = MAX / 4 + 1;
63+
const ll HALF = 2 * ONE_QTR;
64+
const ll THREE_QTR = 3 * ONE_QTR;
65+
66+
string text;
67+
cin >> text;
68+
69+
int len = text.length() + 1;
70+
ll low[len];
71+
ll high[len];
72+
low[0] = MIN;
73+
high[0] = MAX;
74+
int current = 1;
75+
int i = 0;
76+
77+
for(auto i: text){
78+
lower[i] += 1;
79+
}lower[256] = 1;
80+
81+
for(int i=1; i<=256; i++){
82+
lower[i] += lower[i-1];
83+
}
84+
85+
int bit_to_fall = 0;
86+
string code = "";
87+
88+
while(i < len){
89+
if(i == len-1) current = 256;
90+
else current = text[i];
91+
i += 1;
92+
93+
ll range = high[i-1] - low[i-1] + 1;
94+
low[i] = low[i-1] + (range * lower[current-1]) / len;
95+
high[i] = low[i-1] + (range * lower[current]) / len - 1;
96+
97+
while(true){
98+
if(high[i] < HALF){
99+
code += write_bits(0, bit_to_fall);
100+
bit_to_fall = 0;
101+
}
102+
else if(low[i] >= HALF){
103+
code += write_bits(1, bit_to_fall);
104+
bit_to_fall = 0;
105+
low[i] -= HALF;
106+
high[i] -= HALF;
107+
}
108+
else if(low[i] >= ONE_QTR and high[i] < THREE_QTR){
109+
bit_to_fall += 1;
110+
low[i] -= ONE_QTR;
111+
high[i] -= ONE_QTR;
112+
}
113+
else
114+
break;
115+
low[i] = 2 * low[i];
116+
high[i] = 2 * high[i] + 1;
117+
}
118+
}
119+
120+
ll p = low[i-1];
121+
122+
for(int j=15; j>=0; j--){
123+
if((p & (1LL<<j))) code += '1';
124+
else code += '0';
125+
}
126+
127+
cout << len << endl;
128+
129+
for(int i=0; i<=256; i++)
130+
cout << lower[i] << endl;
131+
132+
cout << code << endl;
133+
134+
}
135+
136+
// qhnwnkuewhsqmgbbuqcljjivswmdkqtbxixmvtrrbljptnsnfwzqfjmafadrrwsofsbcnuvqhffbsaqxwpqcaceh

‎huffman_decode.cpp

+93
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,93 @@
1+
#include <bits/stdc++.h>
2+
3+
using namespace std;
4+
5+
struct pixel{
6+
int label;
7+
pixel* left, *right;
8+
9+
pixel(int x): label(x){
10+
left = NULL;
11+
right = NULL;
12+
}
13+
14+
};
15+
16+
pixel* add(pixel* root, int i, string s, string label){
17+
18+
if(root == NULL){
19+
root = new pixel(-1);
20+
}
21+
22+
if(i == s.length()){
23+
cout << s << " " << label << endl;
24+
root->label = stoi(label);
25+
return root;
26+
}
27+
28+
if(s[i] == '0'){
29+
root->left = add(root->left, i+1, s, label);
30+
}
31+
else{
32+
root->right = add(root->right, i+1, s, label);
33+
}
34+
35+
return root;
36+
}
37+
38+
void preoder(pixel* root, string s){
39+
40+
if(root == NULL)
41+
return;
42+
43+
if(root->label != -1){
44+
cout << setfill(' ') << setw(3) << root->label
45+
<< " -> " << setw(7) << s << endl;
46+
return;
47+
}
48+
49+
preoder(root->left, s + '0');
50+
preoder(root->right, s + '1');
51+
52+
return;
53+
}
54+
55+
int main(){
56+
int n;
57+
cin>>n;
58+
pixel* root = new pixel(-1);
59+
for(int i=0; i<n; i++){
60+
string a,b,c;
61+
cin>>a>>b>>c;
62+
add(root, 0, c, a);
63+
}
64+
65+
// for checking
66+
preoder(root, "");
67+
68+
string w;
69+
cin >> w;
70+
71+
pixel* ptr = root;
72+
73+
vector<int> v;
74+
75+
for(auto i:w){
76+
if(i=='0')
77+
ptr = ptr->left;
78+
else
79+
ptr = ptr->right;
80+
if(ptr->label != -1){
81+
v.push_back(ptr->label);
82+
ptr = root;
83+
}
84+
}
85+
86+
for(auto i:v){
87+
cout << (char)i ;
88+
} cout << endl;
89+
90+
return 0;
91+
}
92+
93+
// blvbjeanvnkjvnjlearknjnakrnekndcjbhbllivuekrjhggefskvhfbvkjdbsrjgk

0 commit comments

Comments
 (0)