Submission #893045

#	Time	Username	Problem	Language	Result	Execution time	Memory
893045		Peter2017	Crossing (JOI21_crossing)	C++14	0 / 100	72 ms	42808 KiB

Main

#include <bits/stdc++.h>
#define fi first
#define se second
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pill pair<int,ll>
#define mem(a, b) memset(a, b, sizeof(a))
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define name "test"

using namespace std;

const int N = 1e6 + 5, base = 311;
const int mod[] = {(int)1e9 + 7, 698912399};
const ll oo = 1e18;
const char d[] = {'J', 'O', 'I'};

template <typename T1, typename T2> bool maxi(T1 &a, T2 b){if (a < b){a = b; return 1;} return 0;}
template <typename T1, typename T2> bool mini(T1 &a, T2 b){if (a > b){a = b; return 1;} return 0;}

int n;
int q;
int a[N][3][2];
int Pow[N][2];
int inv[500];
string t;
vector<string> s(3);
map<pii,bool> check1;
map <string,bool> check2;
vector <pii> HashS;

struct SEGTREE{
    int lz[N << 2];
    pii val[N << 2];
    SEGTREE(){};
    pii merge_node(pii a, pii b, int l, int r){
        int m = (l + r) >> 1;
        int le = m - l + 1;
        int r1 = (1ll * a.fi * Pow[le][0] % mod[0] + b.fi) % mod[0];
        int r2 = (1ll * a.se * Pow[le][1] % mod[1] + b.se) % mod[1];
        return {r1, r2};
    }

    void build(int id, int l, int r){
        lz[id] = -1;
        if (l == r){
            val[id].fi =  val[id].se = t[l];
            return;
        }
        int m = (l + r) >> 1;
        build(id << 1, l, m);
        build(id << 1 | 1, m + 1, r);
        val[id] = merge_node(val[id << 1], val[id << 1 | 1], l, r);
    }

    void down(int id, int l, int r){
        if (lz[id] == -1) return;
        val[id].fi = a[r - l + 1][lz[id]][0];
        val[id].se = a[r - l + 1][lz[id]][1];
        if (l < r){
            lz[id << 1] = lz[id];
            lz[id << 1 | 1] = lz[id];
        }
        lz[id] = -1;
    }

    void update(int id, int l, int r, int u, int v, int x){
        down(id, l, r);
        if (l > v || r < u) return;
        if (l >= u && r <= v){
            lz[id] = x;
            down(id, l, r);
            return;
        }
        int m = (l + r) >> 1;
        update(id << 1, l, m, u, v, x);
        update(id << 1 | 1, m + 1, r, u, v, x);
        val[id] = merge_node(val[id << 1], val[id << 1 | 1], l, r);
    }
} ST;

void load(){
    cin.tie(0)->sync_with_stdio(0);
    if (fopen(name".inp", "r")){
        freopen(name".inp", "r", stdin);
        freopen(name".out", "w", stdout);
    }
}

void input(){
    cin >> n;
    for (int i = 0; i < 3; i++)
        cin >> s[i];
    cin >> q;
    cin >> t;
    t = " " + t;
}

void crossing(string a){
    int H[2];
    mem(H, 0);
    for (int i = 0; i < n; i++){
        int cur = a[i];
        for (int j = 0; j < 2; j++)
            H[j] = (1ll * H[j] * base % mod[j] + cur) % mod[j];
    }
    check1[{H[0], H[1]}] = 1;
    HashS.push_back({H[0], H[1]});
}

string haha(string a, string b){
    string res;
    for (int i = 0; i < n; i++){
        if (a[i] == b[i]){
            res += a[i];
        } else {
            int cur = 0;
            for (int j = 0; j < 3; j++)
                if (d[j] != a[i] && d[j] != b[i]) cur = d[j];
            res += (char)cur;
        }
    }
    if (check2.find(res) == check2.end()){
        if (res == "JJOI") cout << a << ' ' << b << '\n';
        s.push_back(res);
        check2[res] = 1;
        crossing(res);
    }
    return res;
}

void solve(){
    for (int i = 0; i < 3; i++)
        inv[d[i]] = i;
    for (int i = 1; i <= n; i++){
        for (int j = 0; j < 3; j++){
            for (int k = 0; k < 2; k++){
                a[i][j][k] = (1ll * a[i - 1][j][k] * base % mod[k] + (int)d[j]) % mod[k];
            }
        }
    }
    for (int i = 0; i < (int)s.size(); i++){
        check2[s[i]] = 1;
        crossing(s[i]);
    }
    for (int i = 0; i < (int)s.size(); i++){
        for (int j = i + 1; j < (int)s.size(); j++){
            haha(s[i], s[j]);
        }
    }
//    for (auto it : s) cout << it << '\n';
//    sort(s.begin(), s.end());
//    s.erase(unique(s.begin(), s.end()), s.end());
    Pow[0][0] = 1;
    Pow[0][1] = 1;
    for (int i = 1; i < N; i++){
        for (int j = 0; j < 2; j++)
            Pow[i][j] = 1ll * Pow[i - 1][j] * base % mod[j];
    }

    ST.build(1, 1, n);

    cout << (check1.find(ST.val[1]) == check1.end() ? "No\n" : "Yes\n");
    for (int i = 1; i <= q; i++){
        int l, r;
        char c;
        cin >> l >> r >> c;
        ST.update(1, 1, n, l, r, inv[c]);
        cout << (check1.find(ST.val[1]) == check1.end() ? "No\n" : "Yes\n");
    }
}

int main(){
    load();
    input();
    solve();
}

Compilation message (stderr)

Main.cpp: In function 'void solve()':
Main.cpp:136:16: warning: array subscript has type 'char' [-Wchar-subscripts]
  136 |         inv[d[i]] = i;
      |             ~~~^
Main.cpp:170:38: warning: array subscript has type 'char' [-Wchar-subscripts]
  170 |         ST.update(1, 1, n, l, r, inv[c]);
      |                                      ^
Main.cpp: In function 'void load()':
Main.cpp:87:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |         freopen(name".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:88:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |         freopen(name".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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