Peli

input/code.cpp: In function 'int main()':
input/code.cpp:6:5: error: 'build_lookup' was not declared in this scope
    6 |     build_lookup();
      |     ^~~~~~~~~~~~
input/code.cpp:14:13: error: 'test' was not declared in this scope; did you mean 'tests'?
   14 |         if (test(a, b)) {
      |             ^~~~
      |             tests

#include <iostream>

bool lookup[2001][2001] = {};

int main() {
    build_lookup();

    int tests;
    std::cin >> tests;

    for (int i = 0; i < tests; i++) {
        int a, b;
        std::cin >> a >> b;
        if (test(a, b)) {
            std::cout << "first";
        } else {
            std::cout << "second";
        }
    }

    return 0;
}

void build_lookup() {
    for (int i = 0; i < 2001; i++) {
        for (int l = 0; l < 2001; l++) {
            bool res = false;
            if (i == l) {
                res = true;
            } else if (i == 0) {
                res = true;
            } else if (l == 0) {
                res = true;
            } else {
                for (int x = 0; x < i; x++) {
                    if (lookup[x][l] == false) {
                        res = true;
                        break;
                    }
                }
                if (res == false) {
                    for (int y = 0; y < l; y++) {
                        if (lookup[i][y] == false) {
                            res = true;
                            break;
                        }
                    }
                }
            }
            lookup[i][l] = res;
        }
    }
}

bool test(int a, int b) {
    return lookup[a][b];
}