This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
vector<vector<int>> devise_strategy(int N) {
int digits = log2(N);
// 3 * xxxxxx + y
// x = quale cifra sto guardando, sapendo che quelle più alte sono uguali
// y = 0 : sono in B e il bit di A è 0
// 1 : sono in B e il bit di A è 1
// 2 : sono in A e devo passare il bit di A in B
vector<vector<int>> s(3 * (digits + 1), vector<int>(N + 1));
for (int x = 0; x < 3 * (digits + 1); x ++) {
// cout << x << '\n';
int bit = x % 3;
int digit = x / 3;
// cout << "x : " << x << '\n';
// cout << "who, bit, digit " << who << " " << bit << " " << digit << '\n';
if (digit == 0) {
// start, occupa quattro casi ma è solo uno tho
s[x][0] = 0;
int digit_next = digits;
for (int j = 1; j <= N; j ++) {
int bit_next = (bool)(j & (1 << (digit_next - 1)));
s[x][j] = (digit_next * 3) + bit_next;
}
continue;
}
if (bit < 2) {
s[x][0] = 1;
int digit_next = digit;
for (int j = 1; j <= N; j ++) {
int bit_next = (bool)(j & (1 << (digit_next - 1)));
// cout << "bit_next : " << bit_next << '\n';
if (bit_next < bit) s[x][j] = -2;
if (bit < bit_next) s[x][j] = -1;
if (bit == bit_next) s[x][j] = (digit_next * 3) + 2;
}
}
if (bit == 2) {
s[x][0] = 0;
int digit_next = digit - 1;
for (int j = 1; j <= N; j ++) {
int bit_next = (bool)(j & (1 << (digit_next - 1)));
s[x][j] = (digit_next * 3) + bit_next;
}
}
}
return s;
}
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