Submission #722938

#	Time	Username	Problem	Language	Result	Execution time	Memory
722938		The_Samurai	Flight to the Ford (BOI22_communication)	C++17	Compilation error	0 ms	0 KiB

communication

#include "communication.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
//
void encode(int N, int X) {
    vector<int> a(2);
    a[1] = (X / 2) % 2;
    a[0] = X % 2;
    for (int i = 0; i < 125; i++) {
        send(a[0]);
        send(a[1]);
    }
}

std::pair<int, int> decode(int N) {
    vector<pair<int, int>> a(2);
    for (int i = 0; i < 124; i++) {
        int x = receive();
        if (x == 0) a[0].first++;
        else a[0].second++;
        x = receive();
        if (x == 0) a[1].first++;
        else a[1].second++;
    }
    int ans = 0;
    if (a[0].first < a[0].second)
        ans += 1;
    if (a[1].first < a[1].second)
        ans += 2;
    return {ans, ans};
}

Compilation message (stderr)

communication.cpp: In function 'void encode(int, int)':
communication.cpp:15:5: error: 'vector' was not declared in this scope
   15 |     vector<int> a(2);
      |     ^~~~~~
communication.cpp:15:12: error: expected primary-expression before 'int'
   15 |     vector<int> a(2);
      |            ^~~
communication.cpp:16:5: error: 'a' was not declared in this scope
   16 |     a[1] = (X / 2) % 2;
      |     ^
communication.cpp: In function 'std::pair<int, int> decode(int)':
communication.cpp:25:5: error: 'vector' was not declared in this scope
   25 |     vector<pair<int, int>> a(2);
      |     ^~~~~~
communication.cpp:25:12: error: 'pair' was not declared in this scope; did you mean 'std::pair'?
   25 |     vector<pair<int, int>> a(2);
      |            ^~~~
      |            std::pair
In file included from /usr/include/c++/10/utility:70,
                 from communication.h:1,
                 from communication.cpp:1:
/usr/include/c++/10/bits/stl_pair.h:211:12: note: 'std::pair' declared here
  211 |     struct pair
      |            ^~~~
communication.cpp:25:17: error: expected primary-expression before 'int'
   25 |     vector<pair<int, int>> a(2);
      |                 ^~~
communication.cpp:28:21: error: 'a' was not declared in this scope
   28 |         if (x == 0) a[0].first++;
      |                     ^
communication.cpp:29:14: error: 'a' was not declared in this scope
   29 |         else a[0].second++;
      |              ^
communication.cpp:31:21: error: 'a' was not declared in this scope
   31 |         if (x == 0) a[1].first++;
      |                     ^
communication.cpp:32:14: error: 'a' was not declared in this scope
   32 |         else a[1].second++;
      |              ^
communication.cpp:35:9: error: 'a' was not declared in this scope
   35 |     if (a[0].first < a[0].second)
      |         ^
communication.cpp:37:9: error: 'a' was not declared in this scope
   37 |     if (a[1].first < a[1].second)
      |         ^