Submission #3907146


Source Code Expand

%:pragma GCC optimize("Ofast", "inline", "-ffast-math")
#include <bits/stdc++.h>
#define rep(i, n) for (rint i = 1; i <= (n); i ++)
#define re0(i, n) for (rint i = 0; i < (int) n; i ++)
#define travel(i, u) for (rint i = head[u]; i; i = e[i].nxt)
#define rint register int
  using namespace std;

typedef long long lo;

template<typename tp> inline void read(tp &x) {
  x = 0; char c = getchar(); int f = 0;
  for (; c < '0' || c > '9'; f |= c == '-', c = getchar());
  for (; c >= '0' && c <= '9'; x = (x << 3) + (x << 1) + c - '0', c = getchar());
  if (f) x = -x;
}
namespace {
  const int mo = 1e9 + 7;
  inline int add(int x, int y) {
    if ((x += y) >= mo) x -= mo;
    return x;
  }
  inline int sub(int x, int y) {
    if ((x -= y) < 0) x += mo;
    return x;
  }
  inline int mul(int x, int y) {
    return 1LL * x * y % mo;
  }
  inline void U(int &x, int y) {
    x = add(x, y);
  }
  inline int power(int a, int k) {
    int ans = 1;
    for (; k; k >>= 1, a = mul(a, a))
      if (k & 1) ans = mul(ans, a);
    return ans;
  }
}
const int N = 333;
int n, rank_c, c[N][N], dp[N][N];
bool visit[N];
bitset <N> d[N], l[N];

int main(void) {
  read(n);
  rep (i, n) rep (j, n) read(c[i][j]);
  rep (j, n) rep (i, n) d[j][i] = c[i][j];
  rep (j, n) {
    for (int wei = n; wei >= 1; wei--)
      if (d[j][wei] == 1) {
	if (!visit[wei]) {
	  l[wei] = d[j];
	  visit[wei] = true;
	  ++rank_c;
	  break;
	}
	d[j] ^= l[wei];
      }
  }
  dp[0][0] = 1;
  re0 (i, n + 1) re0 (j, n + 1) {
    U(dp[i + 1][j], mul(power(2, j), dp[i][j]));
    U(dp[i + 1][j + 1], mul(sub(power(2, n), power(2, j)), dp[i][j]));      
  }
  int ans = 0;
  re0 (i, n + 1) if (i >= rank_c)
    U(ans, mul(dp[n][i], mul(power(2, n * (n - i)), dp[i][rank_c])));
  cout << mul(power(dp[n][rank_c], mo - 2), ans) << "\n";
}

Submission Info

Submission Time
Task H - AB=C Problem
User Walking_The_Wire
Language C++14 (GCC 5.4.1)
Score 1500
Code Size 1871 Byte
Status AC
Exec Time 16 ms
Memory 1152 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 1500 / 1500
Status
AC × 2
AC × 42
Set Name Test Cases
Sample example0.txt, example1.txt
All 000.txt, 001.txt, 002.txt, 003.txt, 004.txt, 005.txt, 006.txt, 007.txt, 008.txt, 009.txt, 010.txt, 011.txt, 012.txt, 013.txt, 014.txt, 015.txt, 016.txt, 017.txt, 018.txt, 019.txt, 020.txt, 021.txt, 022.txt, 023.txt, 024.txt, 025.txt, 026.txt, 027.txt, 028.txt, 029.txt, 030.txt, 031.txt, 032.txt, 033.txt, 034.txt, 035.txt, 036.txt, 037.txt, 038.txt, 039.txt, example0.txt, example1.txt
Case Name Status Exec Time Memory
000.txt AC 1 ms 256 KB
001.txt AC 1 ms 256 KB
002.txt AC 1 ms 256 KB
003.txt AC 1 ms 256 KB
004.txt AC 1 ms 256 KB
005.txt AC 1 ms 256 KB
006.txt AC 1 ms 256 KB
007.txt AC 1 ms 256 KB
008.txt AC 1 ms 256 KB
009.txt AC 1 ms 256 KB
010.txt AC 1 ms 256 KB
011.txt AC 1 ms 256 KB
012.txt AC 1 ms 256 KB
013.txt AC 1 ms 256 KB
014.txt AC 3 ms 512 KB
015.txt AC 3 ms 640 KB
016.txt AC 2 ms 512 KB
017.txt AC 8 ms 768 KB
018.txt AC 2 ms 384 KB
019.txt AC 1 ms 256 KB
020.txt AC 5 ms 640 KB
021.txt AC 16 ms 1024 KB
022.txt AC 2 ms 384 KB
023.txt AC 15 ms 1152 KB
024.txt AC 16 ms 1024 KB
025.txt AC 16 ms 1024 KB
026.txt AC 16 ms 1024 KB
027.txt AC 16 ms 1024 KB
028.txt AC 16 ms 1024 KB
029.txt AC 16 ms 1024 KB
030.txt AC 16 ms 1024 KB
031.txt AC 16 ms 1024 KB
032.txt AC 16 ms 1024 KB
033.txt AC 16 ms 1024 KB
034.txt AC 16 ms 1024 KB
035.txt AC 10 ms 896 KB
036.txt AC 16 ms 1024 KB
037.txt AC 14 ms 1024 KB
038.txt AC 16 ms 1024 KB
039.txt AC 15 ms 1024 KB
example0.txt AC 1 ms 256 KB
example1.txt AC 1 ms 256 KB