Submission #419974

#	Time	Username	Problem	Language	Result	Execution time	Memory
419974		davi_bart	Crossing (JOI21_crossing)	C++14	0 / 100	59 ms	760 KiB

Main

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define int ll
#define fi first
#define se second
#define ld long double
#define pb push_back
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int N,Q;
set<string> k;
string a,b,c;
string t;
vector<bool> ok;
void solve(){
    if(k.count(t))cout<<"YES\n";
    else cout<<"NO\n";
}
string cross(string x,string y){
    string ans="";
    vector<char> s={'I','J','O'};
    for(int i=0;i<x.size();i++){
        if(x[i]==y[i])ans+=x[i];
        else{
            for(auto h:s)if(x[i]!=h && y[i]!=h)ans+=h;
        }
    }
    return ans;
}
void calc(){
    while(1){
        bool ok=0;
        for(auto x:k){
            for(auto y:k){
                string h=cross(x,y);
                if(k.count(h))continue;
                ok=1;
                k.insert(h);
            }
        }
        if(!ok)break;
    }
}
signed main(){
	ios::sync_with_stdio(false);cin.tie(0);
    cin>>N>>a>>b>>c>>Q>>t;
    k.insert(a);k.insert(b);k.insert(c);
    calc();
    assert(k.size()<10);
    solve();
    for(int i=0;i<Q;i++){
        int x,y;
        char z;
        cin>>x>>y>>z;
        x--;y--;
        for(int j=x;j<=y;j++)t[j]=z;
        solve();

    }


}

Compilation message (stderr)

Main.cpp: In function 'std::string cross(std::string, std::string)':
Main.cpp:23:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for(int i=0;i<x.size();i++){
      |                 ~^~~~~~~~~

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