Submission #750968

#	Time	Username	Problem	Language	Result	Execution time	Memory
750968		joelgun14	Crossing (JOI21_crossing)	C++17	26 / 100	7096 ms	2036 KiB

Main

// header file
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
// pragma
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
// macros
#define endl "\n"
#define ll long long
#define mp make_pair
#define ins insert
#define lb lower_bound
#define pb push_back
#define ub upper_bound
#define lll __int128
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_multiset;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
string operate(string a, string b) {
    for(int it = 0; it < a.size(); ++it) {
        if(a[it] == b[it])
            continue;
        bool j = 0, o = 0, i = 0;
        if(a[it] == 'J')
            j = 1;
        else if(a[it] == 'O')
            o = 1;
        else
            i = 1;
        if(b[it] == 'J')
            j = 1;
        else if(b[it] == 'O')
            o = 1;
        else
            i = 1;
        if(!j)
            a[it] = 'J';
        else if(!o)
            a[it] = 'O';
        else
            a[it] = 'I';
    }
    return a;
}
// buat bit 27 state 1 nya implicit disimpan di segment bawahnya
// remove segment bawahnya per segment gtu
// nanti cnt cari mutually exclusive segment
int cnt[3][3][3][3];
int main() {
    ios_base::sync_with_stdio(0); cin.tie(NULL);
    int n;
    cin >> n;
    // coba cek tiap possibility pengambilan
    // max pengambilan cmn 3?
    string a[3];
    cin >> a[0] >> a[1] >> a[2];
    int q;
    cin >> q;
    string init;
    cin >> init;
    bool ans = 0;
    for(int i = 0; i < 3; ++i) {
        string tmp = a[i];
        for(int j = 0; j < 3; ++j) {
            // lakuin operasi antara a[i] dan a[j];
            tmp = operate(tmp, a[j]);
            for(int k = 0; k < 3; ++k) {
                tmp = operate(tmp, a[k]);
                if(tmp == init)
                    ans = 1;
            }
        }
    }
    if(ans)
        cout << "Yes" << endl;
    else
        cout << "No" << endl;
    // coba permutasi size 1, 2, 3
    // given same sequence tp resultnya beda -> pasti gabisa -> O(81Q) -> 1.6e7
    // klo misal ga ada yg beda, berarti max ada 27 aja
    // klo 27, nanti cek O(27^2*Q) -> 1.4e8
    // total O(81Q)
    while(q--) {
        int l, r;
        char x;
        cin >> l >> r >> x;
        for(int i = l - 1; i <= r - 1; ++i)
            init[i] = x;
        bool ans = 0;
        for(int i = 0; i < 3; ++i) {
            string tmp = a[i];
            for(int j = 0; j < 3; ++j) {
                // lakuin operasi antara a[i] dan a[j];,
                tmp = operate(tmp, a[j]);
                for(int k = 0; k < 3; ++k) {
                    tmp = operate(tmp, a[k]);
                    if(tmp == init)
                        ans = 1;
                }
            }
        }
        if(ans)
            cout << "Yes" << endl;
        else
            cout << "No" << endl;
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'std::string operate(std::string, std::string)':
Main.cpp:24:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for(int it = 0; it < a.size(); ++it) {
      |                     ~~~^~~~~~~~~~
Main.cpp:27:28: warning: variable 'i' set but not used [-Wunused-but-set-variable]
   27 |         bool j = 0, o = 0, i = 0;
      |                            ^

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