#include <vector>
#include <set>
#include <iostream>
#include "communication.h"
using namespace std;
inline void s(int& x, int b, int v) { x -= (x & (1 << b)), x |= v << b; }
void encode(int n, int x) {
set<int> todo; for (int i = 0; i < 2; ++i) todo.insert(i);
vector<pair<int, int>> same, diff;
int a = 0, b = 0; b |= 1;
while (todo.size() > 1) {
int b1 = *todo.begin(), b2 = *++todo.begin();
vector<int> res(4);
res[0] = send((x >> b1) & 1);
res[1] = send((x >> b2) & 1);
res[2] = send((x >> b2) & 1);
res[3] = send((x >> b1) & 1);
if (res[1] == res[2]) {
a |= res[1] << b2, b |= res[1] << b2;
todo.erase(b2);
} else if (res[0] == res[3]) {
s(a, b1, res[0]), s(b, b1, res[0]), s(b, b2, 1);
int cur = b1;
while (same.size() || diff.size()) {
pair<int, int> l;
if (same.size()) {
for (int i = 0; i < same.size(); ++i) {
if (same[i].second == cur) {
swap(same[i], same[same.size() - 1]);
break;
}
}
l = same.back();
if (l.second == cur) {
s(a, l.first, (a >> cur) & 1);
s(b, l.first, (b >> cur) & 1);
cur = l.first;
same.resize(same.size() - 1);
continue;
}
}
if (!diff.size()) break;
for (int i = 0; i < diff.size(); ++i) {
if (diff[i].second == cur) {
swap(diff[i], diff[diff.size() - 1]);
break;
}
}
l = diff.back();
if (l.second != cur) break;
s(a, l.first, 1 - ((a >> cur) & 1));
s(b, l.first, 1 - ((b >> cur) & 1));
cur = l.first;
diff.resize(diff.size() - 1);
}
todo.erase(b1);
} else {
int pa = (res[0] == res[1]), pb = 3 - pa;
if (pa) diff.push_back({b1, b2});
else same.push_back({b1, b2});
if (a & (1 << b1)) a |= (pb & 1) << b2;
else a |= (pa & 1) << b2;
if (b & (1 << b1)) b |= (pb & 1) << b2;
else b |= (pa & 1) << b2;
todo.erase(b1);
}
}
}
pair<int, int> decode(int n) {
set<int> todo; for (int i = 0; i < 2; ++i) todo.insert(i);
vector<pair<int, int>> same, diff;
int a = 0, b = 0; b |= 1;
while (todo.size() > 1) {
int b1 = *todo.begin(), b2 = *++todo.begin();
vector<int> res(4);
for (int i = 0; i < 4; ++i) res[i] = receive();
if (res[1] == res[2]) {
a |= res[1] << b2, b |= res[1] << b2;
todo.erase(b2);
} else if (res[0] == res[3]) {
s(a, b1, res[0]), s(b, b1, res[0]), s(b, b2, 1);
int cur = b1;
while (same.size() || diff.size()) {
pair<int, int> l;
if (same.size()) {
for (int i = 0; i < same.size(); ++i) {
if (same[i].second == cur) {
swap(same[i], same[same.size() - 1]);
break;
}
}
l = same.back();
if (l.second == cur) {
s(a, l.first, (a >> cur) & 1);
s(b, l.first, (b >> cur) & 1);
cur = l.first;
same.resize(same.size() - 1);
continue;
}
}
if (!diff.size()) break;
for (int i = 0; i < diff.size(); ++i) {
if (diff[i].second == cur) {
swap(diff[i], diff[diff.size() - 1]);
break;
}
}
l = diff.back();
if (l.second != cur) break;
s(a, l.first, 1 - ((a >> cur) & 1));
s(b, l.first, 1 - ((b >> cur) & 1));
cur = l.first;
diff.resize(diff.size() - 1);
}
todo.erase(b1);
} else {
int pa = (res[0] == res[1]), pb = 3 - pa;
if (pa) diff.push_back({b1, b2});
else same.push_back({b1, b2});
if (a & (1 << b1)) a |= (pb & 1) << b2;
else a |= (pa & 1) << b2;
if (b & (1 << b1)) b |= (pb & 1) << b2;
else b |= (pa & 1) << b2;
todo.erase(b1);
}
}
return {min(a, n), min(b, n)};
}
Compilation message
communication.cpp: In function 'void encode(int, int)':
communication.cpp:29:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
29 | for (int i = 0; i < same.size(); ++i) {
| ~~^~~~~~~~~~~~~
communication.cpp:45:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
45 | for (int i = 0; i < diff.size(); ++i) {
| ~~^~~~~~~~~~~~~
communication.cpp: In function 'std::pair<int, int> decode(int)':
communication.cpp:89:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
89 | for (int i = 0; i < same.size(); ++i) {
| ~~^~~~~~~~~~~~~
communication.cpp:105:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
105 | for (int i = 0; i < diff.size(); ++i) {
| ~~^~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
4 ms |
200 KB |
Not correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
20 ms |
256 KB |
Not correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
