結果

問題 No.1384 Bishop and Rook
ユーザー T101010101
提出日時 2023-02-23 22:37:39
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 152 ms / 2,000 ms
コード長 5,124 bytes
コンパイル時間 2,491 ms
コンパイル使用メモリ 252,808 KB
最終ジャッジ日時 2025-02-10 20:08:09
ジャッジサーバーID
(参考情報)
judge3 / judge4
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 1
other AC * 55
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#pragma region Macros
// #pragma GCC target("avx,avx2,fma")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
#include <bits/extc++.h>
// #include <bits/stdc++.h>
using namespace std;
using namespace __gnu_pbds;
// using namespace __gnu_cxx;
// #include <atcoder/fenwicktree>
// #include <atcoder/segtree>
// #include <atcoder/maxflow>
// using namespace atcoder;
// #include <boost/multiprecision/cpp_int.hpp>
// namespace mp = boost::multiprecision;
// using Bint = mp::cpp_int;
#define TO_STRING(var) # var
#define pb emplace_back
#define int ll
#define endl '\n'
using ll = long long;
using ld = long double;
const ld PI = acos(-1);
const ld EPS = 1e-10;
const ll INFL = 1LL << 61;
// const int MOD = 998244353;
const int MOD = 1000000007;
__attribute__((constructor))
void constructor() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout << fixed << setprecision(15);
}
template<int mod> class modint{
public:
int val = 0;
modint(int x = 0) { while (x < 0) x += mod; val = x % mod; }
modint(const modint &r) { val = r.val; } //
modint operator -(){ return modint(-val); } //
modint operator +(const modint &r) { return modint(*this) += r; }
modint operator -(const modint &r) { return modint(*this) -= r; }
modint operator *(const modint &r) { return modint(*this) *= r; }
modint operator /(const modint &r) { return modint(*this) /= r; }
modint &operator +=(const modint &r) {
val += r.val;
if (val >= mod) val -= mod;
return *this;
}
modint &operator -=(const modint &r) {
if (val < r.val) val += mod;
val -= r.val;
return *this;
}
modint &operator *=(const modint &r) {
val = val * r.val % mod;
return *this;
}
modint &operator /=(const modint &r) {
int a = r.val, b = mod, u = 1, v = 0;
while (b) {
int t = a / b;
a -= t * b; swap(a, b);
u -= t * v; swap(u, v);
}
val = val * u % mod;
if (val < 0) val += mod;
return *this;
}
bool operator ==(const modint& r) { return this -> val == r.val; }
bool operator <(const modint& r) { return this -> val < r.val; }
bool operator !=(const modint& r) { return this -> val != r.val; }
};
using mint = modint<MOD>;
istream &operator >>(istream &is, mint& x) {
int t; is >> t;
x = t;
return (is);
}
ostream &operator <<(ostream &os, const mint& x) {
return os << x.val;
}
mint modpow(const mint &a, int n) {
if (n == 0) return 1;
mint t = modpow(a, n / 2);
t = t * t;
if (n & 1) t = t * a;
return t;
}
int modpow(int x, int N, int mod) {
int ret = 1;
while (N > 0) {
if (N % 2 == 1) ret = ret * x % mod;
x = x * x % mod;
N /= 2;
}
return ret;
}
int ceil(int x, int y) { return (x > 0 ? (x + y - 1) / y : x / y); }
#pragma endregion
signed main() {
int T;
cin >> T;
for (int t = 0; t < T; t++) {
int H, W;
cin >> H >> W;
if (H == 1 && W == 1) {
cout << 0 << endl;
cout << 1 << " " << 1 << endl;
continue;
} else if (H % 2 or W % 2) {
cout << -1 << endl;
continue;
}
int i = 0, j = 1;
int cnt = 0; // HW
// cout << 1 << " " << 2 << endl;
vector<vector<int>> dp(H,vector<int>(W));
cout << H * W - 1 << endl;
while (cnt < H * W) {
cout << i + 1 << " " << j + 1 << endl;
dp[i][j] = cnt;
if (i % 4 < 2) {
if (i % 2 == 0 && j == 1) {
i += 1; j -= 1;
} else if (i % 2 == 1 && j == 0) {
i -= 1;
} else if (i % 2 == 0 && j % 2 == 0) {
i += 1; j += 1;
} else if (i % 2 == 1 && j % 2 == 1 && j + 1 < W) {
j++;
} else if (i % 2 == 1 && j % 2 == 1) {
i++;
} else if (i % 2 == 1) {
i--; j++;
} else if (i % 2 == 0) {
j--;
}
} else {
if (i % 2 == 0 && j == 1) {
i += 1; j -= 1;
} else if (i % 2 == 1 && j == 0) {
i -= 1;
} else if (i % 2 == 0 && j == 0) {
i += 1; j += 1;
} else if (i % 2 == 1 && j == 1) {
i += 1;
} else if (i % 2 == 0 && j % 2 == 1) {
i++; j--;
} else if (i % 2 == 1 && j % 2 == 0) {
j++;
} else if (i % 2 == 1) {
i--; j--;
} else if (i % 2 == 0) {
j--;
}
}
cnt++;
}
// for (int i = 0; i < H; i++) {
// for (int j = 0; j < W; j++) {
// cout << dp[i][j] << " ";
// }
// cout << endl;
// }
}
}
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