#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ii pair<ll,ll>
#define iii pair<ii,ll>
//#define endl '\n'
int n;
string sides;
set<int> al[3005];
struct trip{
int a,b,c;
trip (int _a,int _b,int _c){
a=_a,b=_b,c=_c;
}
};
vector<trip> tri;
map<ii,char> color;
bool dfs(int i,int j){
//cout<<i<<" "<<j<<endl;
//note here that it returns true if triangulation does not exist
if ((j+1)%n==i){
al[i].erase(j);
al[j].erase(i);
return false;
}
else{
auto curr=al[i].find(j);
auto it=(curr==(--al[i].end()))?al[i].begin():next(curr);
//cout<<"DEBUG: "<<i<<" "<<*it<<" "<<j<<endl;
tri.push_back(trip(i,j,*it));
if (i<j && i<*it && *it<j) return true;
if (j<i && (i<*it || *it<j)) return true;
al[i].erase(j);
al[j].erase(i);
if (dfs(i,*it)||dfs(*it,j)) return true;
//cout<<"RET "<<i<<" "<<j<<endl;
return false;
}
}
int main(){
//freopen("input.txt","r",stdin);
ios::sync_with_stdio(0);
cin.tie(0);
cin>>n; //bye bye
cin>>n;
cin>>sides;
for (int x=0;x<n;x++){
al[x].insert((x+1)%n);
al[(x+1)%n].insert(x);
color[ii(x,(x+1)%n)]=sides[x];
color[ii((x+1)%n,x)]=sides[x];
}
int a,b;
char c;
for (int x=3;x<n;x++){
cin>>a>>b>>c;
a--,b--;
al[a].insert(b);
al[b].insert(a);
color[ii(a,b)]=c;
color[ii(b,a)]=c;
}
//we need another case for n==4 bruh
if (n==4){
if (a>b) swap(a,b);
if (a==0 && b==2){
tri.push_back(trip(0,1,2));
tri.push_back(trip(2,3,0));
}
else if (a==1 && b==3){
tri.push_back(trip(1,2,3));
tri.push_back(trip(3,0,1));
}
else{
cout<<"neispravna triangulacija";
return 0;
}
}
else {
if (dfs(0,1)){
cout<<"neispravna triangulacija";
return 0;
}
}
//cout<<"NICE"<<endl;
//now we check for legit colours
if (tri.size()!=n-2) return 1;
for (auto &it:tri){
//cout<<it.a<<" "<<it.b<<" "<<it.c<<endl;
//cout<<color[ii(it.a,it.b)]<<" "<<color[ii(it.b,it.c)]<<" "<<color[ii(it.c,it.a)]<<endl;
if (color[ii(it.a,it.b)]==color[ii(it.a,it.c)] ||
color[ii(it.b,it.a)]==color[ii(it.b,it.c)] ||
color[ii(it.c,it.a)]==color[ii(it.c,it.b)] ){
cout<<"neispravno bojenje";
return 0;
}
}
cout<<"tocno";
}
//neispravna triangulacija -2
//neispravno bojenje -1
//tocno 0
Compilation message
checker.cpp: In function 'int main()':
checker.cpp:113:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if (tri.size()!=n-2) return 1;
~~~~~~~~~~^~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
6 ms |
896 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
6 ms |
896 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
8 ms |
2700 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
8 ms |
2632 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
6 ms |
896 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 2 |
Halted |
0 ms |
0 KB |
- |
