Submission #526625

#	Time	Username	Problem	Language	Result	Execution time	Memory
526625		jalsol	Crossing (JOI21_crossing)	C++11	49 / 100	211 ms	14748 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define Task ""

struct __Init__ {
    __Init__() {
        cin.tie(nullptr)->sync_with_stdio(false);
        if (fopen(Task".inp", "r")) {
            freopen(Task".inp", "r", stdin);
            freopen(Task".out", "w", stdout); }
    }
} __init__;

using ll = long long;

#ifdef LOCAL
#define debug(x) cerr << "[" #x " = " << x << "]\n";
#else
#define debug(...)
#endif // LOCAL

#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define fi first
#define se second

#define For(i, l, r) for (int i = (l); i <= (r); ++i)
#define Ford(i, r, l) for (int i = (r); i >= (l); --i)
#define Rep(i, n) For (i, 0, (n) - 1)
#define Repd(i, n) Ford (i, (n) - 1, 0)

template<class C> int isz(const C& c) { return c.size(); }
template<class T> bool chmin(T& a, const T& b) { if (a > b) { a = b; return true; } return false; }
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } return false; }

constexpr int eps = 1e-9;
constexpr int inf = 1e9;
constexpr ll linf = 1e18;

// =============================================================================

constexpr int maxN = 2e5 + 5;
constexpr int base = 5;

struct mint {
    int v;
    static constexpr int mod = 1e9 + 123;

    mint() : v() {}
    mint(ll _v) : v(_v % mod) { v += mod * (v < 0); }

    mint& operator+=(const mint& o) {
        if ((v += o.v) >= mod) v -= mod;
        return *this;
    }

    mint& operator*=(const mint& o) {
        return *this = mint(1LL * v * o.v);
    }

    friend mint operator+(const mint& a, const mint& b) {
        return mint(a) += b;
    }

    friend mint operator*(const mint& a, const mint& b) {
        return mint(a) *= b;
    }

    bool operator==(const mint& o) const {
        return v == o.v;
    }
};

int n, nq;
string s[3];
string t;

unordered_map<char, int> mp = {{'J', 1}, {'O', 2}, {'I', 3}};
mint pw[maxN];
mint consec[4][maxN];

namespace Tree {
mint tree[maxN << 2];
int lazy[maxN << 2];

#define m ((l + r) / 2)

void pull(int i, int l, int r) {
    tree[i] = tree[i << 1] * pw[r - m] + tree[i << 1 | 1];
}

void push(int i, int l, int r) {
    if (lazy[i] == 0) return;

    tree[i] = consec[lazy[i]][r - l + 1];

    if (l < r) {
        lazy[i << 1] = lazy[i];
        lazy[i << 1 | 1] = lazy[i];
    }

    lazy[i] = 0;
}

void build(int i, int l, int r) {
    if (l == r) {
        tree[i] = mp[t[l - 1]];
        return;
    }

    build(i << 1, l, m);
    build(i << 1 | 1, m + 1, r);
    pull(i, l, r);
}

void update(int u, int v, int x, int i, int l, int r) {
    push(i, l, r);
    if (v < l || r < u) return;

    if (u <= l && r <= v) {
        lazy[i] = x;
        push(i, l, r);
        return;
    }

    update(u, v, x, i << 1, l, m);
    update(u, v, x, i << 1 | 1, m + 1, r);
    pull(i, l, r);
}

#undef m
} // namespace Tree
using namespace Tree;

struct Sub2 {
    void solve() {
        cin >> nq >> t;
        build(1, 1, n);

        mint target = 0;
        For (i, 1, n) {
            target = target * base + mp[s[0][i - 1]];
        }

        cout << (target == tree[1] ? "Yes" : "No") << '\n';

        Rep (_, nq) {
            int l, r; char c; cin >> l >> r >> c;
            update(l, r, mp[c], 1, 1, n);
            cout << (target == tree[1] ? "Yes" : "No") << '\n';
        }
    }
};

struct Sub3 {
    set<string> st;
    vector<string> v {s[0], s[1], s[2]};

    string combine(const string &a, const string& b) {
        string ret(n, ' ');

        Rep (i, n) {
            if (a[i] == b[i]) {
                ret[i] = a[i];
            } else {
                ret[i] = ('J' + 'O' + 'I') - (a[i] + b[i]);
            }
        }

        return ret;
    }

    void solve() {
        st.insert(all(v));

        Rep (i, isz(v)) {
            For (j, i + 1, isz(v) - 1) {
                string nxt = combine(v[i], v[j]);

                if (st.insert(nxt).se) {
                    v.push_back(nxt);
                }
            }
        }

        cin >> nq >> t;
        cout << (st.count(t) ? "Yes" : "No") << '\n';

        Rep (_, nq) {
            int l, r; char c; cin >> l >> r >> c;
            For (i, l, r) t[i - 1] = c;
            cout << (st.count(t) ? "Yes" : "No") << '\n';
        }
    }
};

signed main() {
    cin >> n;
    Rep (i, 3) cin >> s[i];

    pw[0] = 1;
    For (i, 1, maxN - 1) pw[i] = pw[i - 1] * base;

    For (i, 1, maxN - 1) {
        For (c, 1, 3) {
            consec[c][i] = consec[c][i - 1] * base + c;
        }
    }

#define SUB(x) \
    Sub##x* sol = new Sub##x{}; \
    sol->solve(); delete sol

    if (s[0] == s[1] && s[1] == s[2]) {
        SUB(2);
    } else if (n <= 100) {
        SUB(3);
    }
}

/*
    abc def
    1     6
    m = 3

    m + 1 -> r: 6 - 3 = 3
*/

Compilation message (stderr)

Main.cpp: In constructor '__Init__::__Init__()':
Main.cpp:11:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |             freopen(Task".inp", "r", stdin);
      |             ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:12:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |             freopen(Task".out", "w", stdout); }
      |             ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 23 / 23
• Subtask 3: 23 / 23
• Subtask 4: 0 / 51