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#379973#8566. Can We Still Qualify For Semifinals?ucup-team3215#Compile Error//Python33.7kb2024-04-06 20:21:062024-04-06 20:21:06

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  • [2024-04-06 20:21:06]
  • 评测
  • [2024-04-06 20:21:06]
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answer

#include <bits/stdc++.h>

using namespace std;

#define all(x) (x).begin(), (x).end()

using pii = array<int, 2>;
using vi = vector<int>;

array<pii, 45> mt;

struct Dinic {
    struct Edge {
        int to, rev;
        int c, oc;

        int flow() { return max(oc - c, 0); }
    };

    vi lvl, ptr, q;
    vector<vector<Edge>> adj;

    Dinic(int n) : lvl(n), ptr(n), q(n), adj(n) {}

    void addEdge(int a, int b, int c, int rcap = 0) {
        adj[a].emplace_back(b, adj[b].size(), c, c);
        adj[b].emplace_back(a, adj[a].size() - 1, rcap, rcap);
    }

    int dfs(int v, int t, int f) {
        if (v == t || !f)return f;
        for (int &i = ptr[v]; i < size(adj[v]); ++i) {
            Edge &e = adj[v][i];
            if (lvl[e.to] == lvl[v] + 1)
                if (int p = dfs(e.to, t, min(f, e.c))) {
                    e.c -= p, adj[e.to][e.rev].c += p;
                    return p;
                }
        }
        return 0;
    }

    int calc(int s, int t) {
        int flow = 0;
        q[0] = s;
        int L = 30;
        do {
            lvl = ptr = vi(size(q));
            int qi = 0, qe = lvl[s] = 1;
            while (qi < qe && !lvl[t]) {
                int v = q[qi++];
                for (auto e: adj[v]) {
                    if (!lvl[e.to] && e.c >> (30 - L))
                        q[qe++] = e.to, lvl[e.to] = lvl[v] + 1;
                }
            }
            while (int p = dfs(s, t, (int) 2e9 + 13))flow += p;
        } while (lvl[t]);
        return flow;
    }

    bool leftOfMinCut(int a) { return lvl[a] != 0; }
};

void solve() {
    int n;
    string s;
    cin >> n >> s;
    vi wold(10);
    for (int i = 0; i < n; ++i) {
        int b = s[i] - '0';
        ++wold[mt[i][b ^ 1]];
    }
    for (int i = n; i < 45; ++i) {
        auto [x, y] = mt[i];
        if (x == 0) {
            ++wold[x];
        }
    }

    for (int a1 = 1; a1 < 10; ++a1) {
        for (int a2 = a1; a2 < 10; ++a2) {
            for (int a3 = a2; a3 < 10; ++a3) {
                vi w(wold);
                vi bst(10);
                bst[a1] = 1;
                bst[a2] = 1;
                bst[a3] = 1;
                Dinic sol(100);
                int val = w[0];
                int nxt = 0;
                bool ok = true;
                for (int i = n; i < 45; ++i) {
                    auto [x, y] = mt[i];
                    if (x == 0 || bst[x] || bst[y]) {
                        continue;
                    }
                    int who = 1 + nxt++;
                    sol.addEdge(0, who, 1);
                    sol.addEdge(who, 50 + x, 1);
                    sol.addEdge(who, 50 + y, 1);
                }
                for (int i = 1; i < 10; ++i) {
                    if (bst[i])continue;
                    if(w[i] <= val)sol.addEdge(50 + i, 90, val-w[i]);
                    else ok=false;
                }
                if (sol.calc(0, 90) == nxt && ok) {
                    cout << "YES\n";
                    return;
                }
            }
        }
    }
    cout << "NO\n";
}

int main() {
    vi p(10);
    iota(all(p), 0);
    for (int i = 0; i < 9; ++i) {
        for (int j = 0; j < 5; ++j) {
            mt[i * 5 + j] = {p[j], p[9 - j]};
        }
        vi pn(p);
        pn[1] = p.back();
        for (int j = 2; j < 10; ++j) {
            pn[j] = p[j - 1];
        }
        p = pn;
    }
    // for (int i = 0; i < 45; ++i) {
    //     if (i % 5 == 0) {
    //         cout << endl;
    //     }
    //     cout << mt[i][0] + 1 << ' ' << mt[i][1] + 1 << endl;
    // }
    int t;
    cin >> t;
    while (t--) {
        solve();
    }
}

Details

  File "answer.code", line 3
    using namespace std;
          ^^^^^^^^^
SyntaxError: invalid syntax