Submission #712020

#	Time	Username	Problem	Language	Result	Execution time	Memory
712020		pcc	Checker (COCI19_checker)	C++14	110 / 110	390 ms	55344 KiB

checker

#include <bits/stdc++.h>
using namespace std;

#define pii pair<int,int>
#define fs first
#define sc second
struct node{
    set<pii> st;
    int pre,nxt;
    bool del;
    node(){
        pre = nxt = 0;
        del = false;
    }
    void add(int to,int c){
        st.insert({to,c});
    }
    int get(int k){
        auto it = st.upper_bound(make_pair(k,-1));
        if(it == st.end()||it->fs != k)return 0;
        return it->sc;
    }
};
const int mxn = 2e5+10;
node v[mxn];
void remov(int k){
    v[v[k].pre].nxt = v[k].nxt;
    v[v[k].nxt].pre = v[k].pre;
    v[k].del = true;
    return;
}
bool dif(int a,int b,int c){
    if(!a||!b||!c)return 0;
    if(a == b||c == b||a == c)return 0;
    return 1;
}
int pos[mxn];
vector<pii> edges;
int n;
bool cmp(pii a,pii b){
    int l1 = min(a.sc-a.fs,n-(a.sc-a.fs));
    int l2 = min(b.sc-b.fs,n-(b.sc-b.fs));
    return l1<l2;
}
int main(){
    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin>>n>>n;
    string col;
    cin>>col;
    for(int i = 1;i<n;i++){
        v[i].add(i+1,col[i-1]-'0');
        v[i+1].add(i,col[i-1]-'0');
    }
    v[n].add(1,col.back()-'0');
    v[1].add(n,col.back()-'0');
    for(int i = 0;i<n-3;i++){
        int a,b,c;
        cin>>a>>b>>c;
        edges.push_back({min(a,b),max(a,b)});
        v[a].add(b,c);
        v[b].add(a,c);
    }
    for(int i = 1;i<=n;i++)v[i].pre = i-1;
    for(int i = n-1;i>=1;i--)v[i].nxt = i+1;
    v[1].pre = n;
    v[n].nxt = 1;
    sort(edges.begin(),edges.end(),cmp);
    bool flag = true;
    for(auto &i:edges){
        int a = i.fs,b = i.sc;
        if(v[a].del||v[b].del){
            cout<<"neispravna triangulacija\n";
            return 0;
        }
        if(v[v[b].pre].pre != a)swap(a,b);
        if(!dif(v[b].get(v[b].pre),v[b].get(a),v[a].get(v[b].pre))){
            flag = false;
        }
        if(v[v[b].pre].pre == a){
            remov(v[b].pre);
        }
        else{
            cout<<"neispravna triangulacija\n";
            return 0;
        }
    }
    if(flag){
        cout<<"tocno\n";
    }
    else cout<<"neispravno bojenje\n";
}

• Subtask 1: 12 / 12
• Subtask 2: 17 / 17
• Subtask 3: 23 / 23
• Subtask 4: 23 / 23
• Subtask 5: 35 / 35