Submission #710703

#	Time	Username	Problem	Language	Result	Execution time	Memory
710703		Ronin13	Crossing (JOI21_crossing)	C++14	26 / 100	403 ms	90832 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define f first
#define s second
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pb push_back
#define epb emplace_back
using namespace std;
const int nmax = 1000001;

map <vector <int> , bool> used;

vector <vector <int> >  vec;

vector <int> op(vector <int> &a, vector <int> &b){
    vector <int> ans;
    for(int i = 0; i < a.size(); i++){
        int x = a[i] + b[i];
        x = -x;
        x %= 3;
        x += 3;
        x %= 3;
        ans.pb(x);
    }
    return ans;
}

void rec(vector <int> v){
    used[v] = true;
    for(auto to : vec){
        vector <int> x = op(to, v);
        if(used[x]) continue;
        rec(x);
    }
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(0);
    int n; cin >> n;
    string a[3];
    for(int i = 0; i < 3; i++){
        vector<int> v;
        cin >> a[i];
        for(int j = 0; j < n; j++){
            if(a[i][j] == 'O')
                v.pb(0);
            if(a[i][j] == 'J')
                v.pb(1);
            if(a[i][j] == 'I')
                v.pb(2);
        }
        used[v] = true;
        vec.pb(v);
    }
    for(int i = 0; i < 3; i++)
        rec(vec[i]);
    int q; cin >> q;
    vector <int> t;
    for(int i = 0; i < n; i++){
        char c; cin >> c;
        if(c == 'J')
            t.pb(1);
        if(c == 'O')
            t.pb(0);
        if(c == 'I')
            t.pb(2);
    }
    bool xx = used[t];
    if(xx) cout << "Yes\n";
    else cout << "No\n";
    while(q--){
        int l,r; cin >> l >> r;
        char c; cin >> c;
        int x;
        if(c == 'O')
            x = 0;
        if(c == 'J')
            x = 1;
        if(c == 'I')
            x = 2;
        if(n <= 100){
        for(int i = l - 1; i < r; i++)
            t[i] = x;
        used[t] ? cout << "Yes\n" : cout << "No\n";}
        else
            xx ? cout << "Yes\n" : cout << "No\n";
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'std::vector<int> op(std::vector<int>&, std::vector<int>&)':
Main.cpp:19:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for(int i = 0; i < a.size(); i++){
      |                    ~~^~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:85:18: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   85 |             t[i] = x;

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