結果

問題 No.1596 Distance Sum in 2D Plane
ユーザー JiKuai
提出日時 2021-07-09 22:17:53
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 238 ms / 2,000 ms
コード長 2,041 bytes
コンパイル時間 2,288 ms
コンパイル使用メモリ 196,920 KB
最終ジャッジ日時 2025-01-22 22:03:05
ジャッジサーバーID
(参考情報)
judge2 / judge3
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ファイルパターン 結果
sample AC * 3
other AC * 17
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

/*
-------------- | /
| | /
| | /
| * |/ | | ------ *
| | | | / \
| | |\ | | | |\ |
\ | | | \ | | | | \ |
\ | | | \ | | \ / \ |
V | | \ \__/| ----- \ |
*/
#include <bits/stdc++.h>
using namespace std;
#define debug(x) cerr << "\e[1;31m" << #x << " = " << (x) << "\e[0m\n"
#define print(x) emilia_mata_tenshi(#x, begin(x), end(x))
template<typename T> void emilia_mata_tenshi(const char *s, T l, T r) {
cerr << "\e[1;33m" << s << " = [";
while(l != r) {
cerr << *l;
cerr << (++l == r ? ']' : ',');
}
cerr << "\e[0m\n";
}
#define EmiliaMyWife ios::sync_with_stdio(0); cin.tie(NULL);
using ll = int64_t;
using ull = uint64_t;
using ld = long double;
using uint = uint32_t;
const double EPS = 1e-8;
const int INF = 0x3F3F3F3F;
const ll LINF = 4611686018427387903;
const int MOD = 1e9+7;
/*--------------------------------------------------------------------------------------*/
signed main() { EmiliaMyWife
int n, m;
cin >> n >> m;
vector<ll> fac(n * 2 + 3, 1);
for(int i = 1; i <= n * 2 + 2; i++)
fac[i] = fac[i - 1] * i % MOD;
auto mpow = [&](ll a, int b) {
ll res = 1;
for(; b; b >>= 1, a = a * a % MOD)
if(b & 1)
res = res * a % MOD;
return res;
};
auto cnm = [&](int n, int m) {
if(n < m)
return ll(0);
return fac[n] * mpow(fac[m], MOD - 2) % MOD * mpow(fac[n - m], MOD - 2) % MOD;
};
auto cal = [&](int a, int b) { return cnm(a + b, a); };
ll ans = cal(n, n) * n * 2 % MOD;
//debug(ans);
while(m--) {
int t, x, y;
cin >> t >> x >> y;
int dx = x, dy = y;
if(t == 1)
dx++;
else
dy++;
ans = (ans - cal(x, y) * cal(n - dx, n - dy) % MOD + MOD) % MOD;
}
cout << ans << '\n';
}
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