#include"communication.h"
#include <bits/stdc++.h>
//
// --- Sample implementation for the task communication ---
//
// To compile this program with the sample grader, place:
// communication.h communication_sample.cpp sample_grader.cpp
// in a single folder, then open the terminal in this directory (right-click onto an empty spot in the directory,
// left click on "Open in terminal") and enter e.g.:
// g++ -std=c++17 communication_sample.cpp sample_grader.cpp
// in this folder. This will create a file a.out in the current directory which you can execute from the terminal
// as ./a.out
// See task statement or sample_grader.cpp for the input specification
using namespace std;
const int LOG = 2;
int f(int x) {
return 31 - __builtin_clz(x);
}
void encode(int N, int X) {
int ans1 = 0, ans2 = 1;
for (int i = 1; i < LOG; i++) {
if (ans2 < ans1) swap(ans1, ans2);
if (ans1 == ans2) {
ans2 ^= (1 << i);
continue;
}
int x = f(ans1 ^ ans2);
int a = send((X >> x) & 1), b = send((X >> i) & 1), c = send((X >> x) & 1), d = send((X >> i) & 1);
if (b == c) {
ans1 ^= (b << i);
ans2 ^= (b << i);
continue;
}
if (a == d) {
if (d) ans1 = ans2;
else ans2 = ans1;
ans2 ^= (1 << i);
continue;
}
int tans1 = ((d ? ans2 : ans1) ^ (b << i)); // 0101
int tans2 = ((a ? ans2 : ans1) ^ (c << i)); // 1010
ans1 = tans1, ans2 = tans2;
}
}
pair<int, int> decode(int N) {
int ans1 = 0, ans2 = 1;
for (int i = 1; i < LOG; i++) {
if (ans2 < ans1) swap(ans1, ans2);
if (ans1 == ans2) {
ans2 ^= (1 << i);
continue;
}
int x = f(ans1 ^ ans2);
int a = receive(), b = receive(), c = receive(), d = receive();
if (b == c) {
ans1 ^= (b << i);
ans2 ^= (b << i);
continue;
}
if (a == d) {
if (d) ans1 = ans2;
else ans2 = ans1;
ans2 ^= (1 << i);
continue;
}
int tans1 = ((d ? ans2 : ans1) ^ (b << i)); // 0101
int tans2 = ((a ? ans2 : ans1) ^ (c << i)); // 1010
ans1 = tans1, ans2 = tans2;
}
if (ans1 <= 0 || ans1 > N) ans1 = 1;
if (ans2 <= 0 || ans2 > N) ans2 = 1;
return {ans1, ans2};
}
Compilation message
communication.cpp: In function 'std::pair<int, int> decode(int)':
communication.cpp:64:7: warning: unused variable 'x' [-Wunused-variable]
64 | int x = f(ans1 ^ ans2);
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
3 ms |
200 KB |
Not correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
20 ms |
200 KB |
Not correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
