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#6009. 「网络流 24 题」软件补丁

https://loj.ac/s/1578956
This commit is contained in:
Baoshuo Ren 2022-09-13 20:46:39 +08:00
parent 2ec62c8df4
commit 939dc609f8
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
21 changed files with 150 additions and 0 deletions

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#include <iostream>
#include <algorithm>
#include <array>
#include <queue>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 25,
M = 105;
const int INF = 0x3f3f3f3f;
int n, m;
std::array<int, M> a, b1, b2, f1, f2;
std::array<int, 1 << N> dist;
std::array<bool, 1 << N> vis;
bool check(int s, int i) {
if ((b1[i] | s) != s) return false;
if (b2[i] & s) return false;
return true;
}
void spfa(int s) {
std::fill(dist.begin(), dist.end(), INF);
std::queue<int> q;
q.push(s);
dist[s] = 0;
vis[s] = true;
while (!q.empty()) {
int u = q.front();
q.pop();
for (int i = 1; i <= m; i++) {
if (!check(u, i)) continue;
int v = u ^ (u & f1[i]) | f2[i];
if (dist[u] + a[i] < dist[v]) {
dist[v] = dist[u] + a[i];
if (!vis[v]) {
q.push(v);
vis[v] = true;
}
}
}
vis[u] = false;
}
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
for (int i = 1; i <= m; i++) {
std::string b, f;
cin >> a[i] >> b >> f;
for (int j = 0; j < b.size(); j++) {
if (b[j] == '+') {
b1[i] = b1[i] | 1 << j;
} else if (b[j] == '-') {
b2[i] = b2[i] | 1 << j;
}
}
for (int j = 0; j < f.size(); j++) {
if (f[j] == '-') {
f1[i] = f1[i] | 1 << j;
} else if (f[j] == '+') {
f2[i] = f2[i] | 1 << j;
}
}
}
spfa((1 << n) - 1);
cout << (dist[0] == INF ? 0 : dist[0]) << endl;
return 0;
}

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