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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#235347 | #7648. 网格图最大流计数 | hos_lyric# | 15 | 604ms | 21312kb | C++14 | 8.3kb | 2023-11-02 17:43:29 | 2024-07-04 02:22:45 |
Judging History
answer
#include <cassert>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <functional>
#include <iostream>
#include <limits>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
using namespace std;
using Int = long long;
template <class T1, class T2> ostream &operator<<(ostream &os, const pair<T1, T2> &a) { return os << "(" << a.first << ", " << a.second << ")"; };
template <class T> ostream &operator<<(ostream &os, const vector<T> &as) { const int sz = as.size(); os << "["; for (int i = 0; i < sz; ++i) { if (i >= 256) { os << ", ..."; break; } if (i > 0) { os << ", "; } os << as[i]; } return os << "]"; }
template <class T> void pv(T a, T b) { for (T i = a; i != b; ++i) cerr << *i << " "; cerr << endl; }
template <class T> bool chmin(T &t, const T &f) { if (t > f) { t = f; return true; } return false; }
template <class T> bool chmax(T &t, const T &f) { if (t < f) { t = f; return true; } return false; }
#define COLOR(s) ("\x1b[" s "m")
////////////////////////////////////////////////////////////////////////////////
template <unsigned M_> struct ModInt {
static constexpr unsigned M = M_;
unsigned x;
constexpr ModInt() : x(0U) {}
constexpr ModInt(unsigned x_) : x(x_ % M) {}
constexpr ModInt(unsigned long long x_) : x(x_ % M) {}
constexpr ModInt(int x_) : x(((x_ %= static_cast<int>(M)) < 0) ? (x_ + static_cast<int>(M)) : x_) {}
constexpr ModInt(long long x_) : x(((x_ %= static_cast<long long>(M)) < 0) ? (x_ + static_cast<long long>(M)) : x_) {}
ModInt &operator+=(const ModInt &a) { x = ((x += a.x) >= M) ? (x - M) : x; return *this; }
ModInt &operator-=(const ModInt &a) { x = ((x -= a.x) >= M) ? (x + M) : x; return *this; }
ModInt &operator*=(const ModInt &a) { x = (static_cast<unsigned long long>(x) * a.x) % M; return *this; }
ModInt &operator/=(const ModInt &a) { return (*this *= a.inv()); }
ModInt pow(long long e) const {
if (e < 0) return inv().pow(-e);
ModInt a = *this, b = 1U; for (; e; e >>= 1) { if (e & 1) b *= a; a *= a; } return b;
}
ModInt inv() const {
unsigned a = M, b = x; int y = 0, z = 1;
for (; b; ) { const unsigned q = a / b; const unsigned c = a - q * b; a = b; b = c; const int w = y - static_cast<int>(q) * z; y = z; z = w; }
assert(a == 1U); return ModInt(y);
}
ModInt operator+() const { return *this; }
ModInt operator-() const { ModInt a; a.x = x ? (M - x) : 0U; return a; }
ModInt operator+(const ModInt &a) const { return (ModInt(*this) += a); }
ModInt operator-(const ModInt &a) const { return (ModInt(*this) -= a); }
ModInt operator*(const ModInt &a) const { return (ModInt(*this) *= a); }
ModInt operator/(const ModInt &a) const { return (ModInt(*this) /= a); }
template <class T> friend ModInt operator+(T a, const ModInt &b) { return (ModInt(a) += b); }
template <class T> friend ModInt operator-(T a, const ModInt &b) { return (ModInt(a) -= b); }
template <class T> friend ModInt operator*(T a, const ModInt &b) { return (ModInt(a) *= b); }
template <class T> friend ModInt operator/(T a, const ModInt &b) { return (ModInt(a) /= b); }
explicit operator bool() const { return x; }
bool operator==(const ModInt &a) const { return (x == a.x); }
bool operator!=(const ModInt &a) const { return (x != a.x); }
friend std::ostream &operator<<(std::ostream &os, const ModInt &a) { return os << a.x; }
};
////////////////////////////////////////////////////////////////////////////////
constexpr unsigned MO = 1000000007;
using Mint = ModInt<MO>;
template <class Flow> struct MaxFlow {
// Watch out when using types other than int and long long.
static constexpr Flow FLOW_EPS = 1e-10L;
static constexpr Flow FLOW_INF = std::numeric_limits<Flow>::max();
int n, m;
vector<int> ptr, nxt, zu;
vector<Flow> capa;
explicit MaxFlow(int n_) : n(n_), m(0), ptr(n_, -1) {}
void ae(int u, int v, Flow w0, Flow w1 = 0) {
assert(0 <= u); assert(u < n);
assert(0 <= v); assert(v < n);
assert(0 <= w0);
assert(0 <= w1);
nxt.push_back(ptr[u]); zu.push_back(v); capa.push_back(w0); ptr[u] = m++;
nxt.push_back(ptr[v]); zu.push_back(u); capa.push_back(w1); ptr[v] = m++;
}
vector<int> see, lev, que;
Flow augment(int u, int t, Flow limFlow) {
if (u == t) return limFlow;
for (int &i = see[u]; ~i; i = nxt[i]) if (capa[i] > FLOW_EPS) {
const int v = zu[i];
if (lev[u] < lev[v]) {
const Flow f = augment(v, t, min(limFlow, capa[i]));
if (f > FLOW_EPS) { capa[i] -= f; capa[i ^ 1] += f; return f; }
}
}
return 0;
}
bool bfs(int s, int t) {
for (int u = 0; u < n; ++u) { see[u] = ptr[u]; lev[u] = -1; }
auto head = que.begin(), tail = que.begin();
for (lev[*tail++ = s] = 0; head != tail; ) {
const int u = *head++;
for (int i = ptr[u]; ~i; i = nxt[i]) if (capa[i] > FLOW_EPS) {
const int v = zu[i];
if (!~lev[v]) {
lev[*tail++ = v] = lev[u] + 1;
if (v == t) return true;
}
}
}
return false;
}
Flow run(int s, int t, Flow limFlow = FLOW_INF) {
see.resize(n); lev.resize(n); que.resize(n);
Flow flow = 0;
for (; flow + FLOW_EPS < limFlow && bfs(s, t); ) {
for (Flow f; (f = augment(s, t, limFlow - flow)) > FLOW_EPS; flow += f) {}
}
return flow;
}
};
////////////////////////////////////////////////////////////////////////////////
Mint det(vector<vector<Mint>> a) {
const int n = a.size();
Mint ret = 1;
for (int h = 0; h < n; ++h) {
for (int i = h; i < n; ++i) if (a[i][h]) {
if (h != i) {
swap(a[h], a[i]);
ret = -ret;
}
break;
}
ret *= a[h][h];
if (!ret) break;
const Mint s = a[h][h].inv();
for (int j = h + 1; j < n; ++j) a[h][j] *= s;
for (int i = h + 1; i < n; ++i) {
const Mint t = a[i][h];
if (t) for (int j = h + 1; j < n; ++j) a[i][j] -= t * a[h][j];
}
}
return ret;
}
int M, N, K;
vector<int> A, B;
char S[410][410];
int id(int s, int x, int y) {
return 2 + (x * K + y) * 2 + s;
}
int F;
vector<vector<Mint>> mat;
namespace brute {
Mint run() {
cerr<<"[brute::run]"<<endl;
vector<Mint> dp(1 << N, 0);
dp[0] = 1;
for (int j = 0; j < N; ++j) {
for (int h = 1 << M; --h >= 0; ) {
for (int i = 0; i < M; ++i) if (!(h & 1 << i)) {
dp[h | 1 << i] += (__builtin_parity(h >> i) ? -1 : +1) * dp[h] * mat[i][j];
}
}
}
Mint ans = 0;
for (int h = 0; h < 1 << M; ++h) if (__builtin_popcount(h) == F) {
ans += dp[h];
}
return ans;
}
} // brute
int main() {
for (; ~scanf("%d%d%d", &M, &N, &K); ) {
A.resize(M); for (int i = 0; i < M; ++i) { scanf("%d", &A[i]); --A[i]; }
B.resize(N); for (int j = 0; j < N; ++j) { scanf("%d", &B[j]); --B[j]; }
for (int x = 0; x < K; ++x) {
scanf("%s", S[x]);
}
MaxFlow<int> mf(2 + 2 * K * K);
for (int i = 0; i < M; ++i) mf.ae(0, id(0, 0, A[i]), 1);
for (int j = 0; j < N; ++j) mf.ae(id(1, K - 1, B[j]), 1, 1);
for (int x = 0; x < K; ++x) for (int y = 0; y < K; ++y) {
if (x + 1 < K) mf.ae(id(1, x, y), id(0, x + 1, y), 1);
if (y + 1 < K) mf.ae(id(1, x, y), id(0, x, y + 1), 1);
}
for (int x = 0; x < K; ++x) for (int y = 0; y < K; ++y) if (S[x][y] == '1') mf.ae(id(0, x, y), id(1, x, y), 1);
F = mf.run(0, 1);
mat.assign(M, vector<Mint>(N));
static Mint dp[410][410];
for (int i = 0; i < M; ++i) {
memset(dp, 0, sizeof(dp));
dp[0][A[i]] = 1;
for (int x = 0; x < K; ++x) for (int y = 0; y < K; ++y) if (S[x][y] == '1') {
if (x + 1 < K && S[x + 1][y] == '1') dp[x + 1][y] += dp[x][y];
if (y + 1 < K && S[x][y + 1] == '1') dp[x][y + 1] += dp[x][y];
}
for (int j = 0; j < N; ++j) {
mat[i][j] = dp[K - 1][B[j]];
}
}
Mint ans;
if (M == N && M == F) {
ans = det(mat);
} else if (M <= 10) {
ans = brute::run();
} else {
assert(false);
}
printf("%d %u\n", F, ans.x);
}
return 0;
}
詳細信息
Subtask #1:
score: 5
Accepted
Test #1:
score: 5
Accepted
time: 1ms
memory: 4728kb
input:
7 7 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1111111 1111111 1111111 1111111 1111111 1111111 1111111
output:
7 1
result:
ok 2 number(s): "7 1"
Test #2:
score: 0
Accepted
time: 1ms
memory: 4448kb
input:
7 7 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1111111 1111111 1111111 1111111 1111111 1111111 1111111
output:
7 1
result:
ok 2 number(s): "7 1"
Test #3:
score: 0
Accepted
time: 1ms
memory: 4468kb
input:
7 7 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1111111 1111111 1111111 1111111 1111111 1111111 1111111
output:
7 1
result:
ok 2 number(s): "7 1"
Test #4:
score: 0
Accepted
time: 1ms
memory: 4464kb
input:
7 7 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1111111 1111111 1111111 1111111 1111111 1110111 1111111
output:
6 52
result:
ok 2 number(s): "6 52"
Test #5:
score: 0
Accepted
time: 1ms
memory: 4464kb
input:
7 7 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1111111 1111111 1111111 1111111 1111111 1110111 1111111
output:
6 52
result:
ok 2 number(s): "6 52"
Subtask #2:
score: 0
Runtime Error
Dependency #1:
100%
Accepted
Test #6:
score: 0
Runtime Error
input:
16 17 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 111111111111111111 111111111111111111 111011111111111111 111111111111111111 111111111111111111 111011110111111111 111111111111111111 111111111111111111 111111111111111111 111111111111111111 111111111111111111 1...
output:
result:
Subtask #3:
score: 0
Skipped
Dependency #2:
0%
Subtask #4:
score: 0
Skipped
Dependency #3:
0%
Subtask #5:
score: 10
Accepted
Test #31:
score: 10
Accepted
time: 464ms
memory: 20756kb
input:
73 73 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 ...
output:
73 849796347
result:
ok 2 number(s): "73 849796347"
Test #32:
score: 0
Accepted
time: 431ms
memory: 20180kb
input:
68 68 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152...
output:
68 334069950
result:
ok 2 number(s): "68 334069950"
Test #33:
score: 0
Accepted
time: 460ms
memory: 20584kb
input:
72 72 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133...
output:
72 180096245
result:
ok 2 number(s): "72 180096245"
Test #34:
score: 0
Accepted
time: 442ms
memory: 20400kb
input:
71 71 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 13...
output:
71 234343448
result:
ok 2 number(s): "71 234343448"
Test #35:
score: 0
Accepted
time: 415ms
memory: 20188kb
input:
68 68 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152...
output:
68 371509898
result:
ok 2 number(s): "68 371509898"
Test #36:
score: 0
Accepted
time: 566ms
memory: 20604kb
input:
200 200 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 ...
output:
200 852372194
result:
ok 2 number(s): "200 852372194"
Test #37:
score: 0
Accepted
time: 581ms
memory: 21004kb
input:
230 230 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 ...
output:
230 65874836
result:
ok 2 number(s): "230 65874836"
Test #38:
score: 0
Accepted
time: 597ms
memory: 21312kb
input:
260 260 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 ...
output:
260 272563656
result:
ok 2 number(s): "260 272563656"
Test #39:
score: 0
Accepted
time: 604ms
memory: 20976kb
input:
290 290 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 ...
output:
290 95450701
result:
ok 2 number(s): "290 95450701"
Test #40:
score: 0
Accepted
time: 599ms
memory: 21168kb
input:
320 320 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 ...
output:
320 266455174
result:
ok 2 number(s): "320 266455174"
Subtask #6:
score: 0
Runtime Error
Dependency #5:
100%
Accepted
Test #41:
score: 0
Runtime Error
input:
107 371 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 ...
output:
result:
Subtask #7:
score: 0
Skipped
Dependency #1:
100%
Accepted
Dependency #2:
0%