POJ 1275 Cashier Employment

传送门

同 AcWing 393 雇佣收银员、HDOJ 1529 Cashier Employment、ZOJ 1420 Cashier Employment、UVALive 2058 Cashier Employment

#include <iostream>
#include <cstdio>
#include <cstring>
#include <queue>

using namespace std;
typedef long long ll;
typedef pair<int, int> p;
const int maxn(30);
const int maxm(1e2);
bool vis[maxn];
int r[maxn], num[maxn];
int ecnt, head[maxn], cnt[maxn], dis[maxn];

struct edge {
    int to, wt, nxt;
} edges[maxm];

template<typename T>
inline const T read()
{
    T x = 0, f = 1;
    char ch = getchar();
    while (ch < '0' || ch > '9') {
        if (ch == '-') f = -1;
        ch = getchar();
    }
    while (ch >= '0' && ch <= '9') {
        x = (x << 3) + (x << 1) + ch - '0';
        ch = getchar();
    }
    return x * f;
}

template<typename T>
inline void write(T x, bool ln)
{
    if (x < 0) {
        putchar('-');
        x = -x;
    }
    if (x > 9) write(x / 10, false);
    putchar(x % 10 + '0');
    if (ln) putchar(10);
}

void addEdge(int u, int v, int w)
{
    edges[ecnt].to = v;
    edges[ecnt].wt = w;
    edges[ecnt].nxt = head[u];
    head[u] = ecnt++;
}

void build(int s24)
{
    ecnt = 0;
    memset(head, -1, sizeof head);
    for (int i = 1; i <= 24; ++i) {
        addEdge(i - 1, i, 0);
        addEdge(i, i - 1, -num[i]);
    }
    for (int i = 8; i <= 24; ++i) {
        addEdge(i - 8, i, r[i]);
    }
    for (int i = 1; i <= 7; ++i) {
        addEdge(i + 16, i, r[i] - s24);
    }
    addEdge(0, 24, s24);
    addEdge(24, 0, -s24);
}

bool spfa(int s24)
{
    build(s24);
    memset(dis, -0x3f, sizeof dis);
    memset(cnt, 0, sizeof cnt);
    memset(vis, false, sizeof vis);
    dis[0] = 0;
    vis[0] = true;
    queue<int> q;
    q.push(0);
    while (not q.empty()) {
        int u = q.front();
        q.pop();
        vis[u] = false;
        for (int i = head[u]; compl i; i = edges[i].nxt) {
            int v = edges[i].to, w = edges[i].wt;
            if (dis[v] < dis[u] + w) {
                dis[v] = dis[u] + w;
                if (not vis[v]) {
                    vis[v] = true;
                    q.push(v);
                    cnt[v] = cnt[u] + 1;
                    if (cnt[v] == 25) {
                        return false;
                    }
                }
            }
        }
    }
    return true;
}

int main()
{
#ifdef ONLINE_JUDGE
#else
    freopen("input.txt", "r", stdin);
#endif
    ios::sync_with_stdio(false);
    int t = read<int>();
    while (t--) {
        memset(num, 0, sizeof num);
        for (int i = 1; i <= 24; ++i) {
            r[i] = read<int>();
        }
        int n = read<int>();
        for (int i = 0; i < n; ++i) {
            ++num[read<int>() + 1];
        }
        bool flag = false;
        for (int i = 0; i <= 1000; ++i) {
            if (spfa(i)) {
                flag = true;
                printf("%d\n", i);
                break;
            }
        }
        if (not flag) {
            printf("No Solution\n");
        }
    }
    return 0;
}