oj.uz

Submission #341386

# Submission time Handle Problem Language Result Execution time Memory
341386 2020-12-29T15:37:25 Z ryansee Monochrome Points (JOI20_monochrome) C++14
0 / 100
 2000 ms 492 KB 
#include "bits/stdc++.h"
using namespace std;

#define FAST ios_base::sync_with_stdio(false); cin.tie(0);
#define pb push_back
#define eb emplace_back
#define ins insert
#define f first
#define s second
#define cbr cerr<<"hi\n"
#define mmst(x, v) memset((x), v, sizeof ((x)))
#define siz(x) ll(x.size())
#define all(x) (x).begin(), (x).end()
#define lbd(x,y) (lower_bound(all(x),y)-x.begin())
#define ubd(x,y) (upper_bound(all(x),y)-x.begin())
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());    //can be used by calling rng() or shuffle(A, A+n, rng)
inline long long rand(long long x, long long y) { return rng() % (y+1-x) + x; } //inclusivesss
string inline to_string(char c) {string s(1,c);return s;} template<typename T> inline T gcd(T a,T b){ return a==0?llabs(b):gcd(b%a,a); }

using ll=long long; 
using ld=long double;
#define FOR(i,s,e) for(ll i=s;i<=ll(e);++i)
#define DEC(i,s,e) for(ll i=s;i>=ll(e);--i)
using pi=pair<ll,ll>; using spi=pair<ll,pi>; using dpi=pair<pi,pi>; 

long long LLINF = 1e18;
int INF = 1e9+1e6;
#define MAXN (400006)
ll n, ans;
string A;
int main() {
	FAST
	cin>>n>>A;A='*'+A;n*=2;
	vector<int> v;
	FOR(i,1,n) v.eb(i);
	do {
		bool bad = 0;
		vector<pi> p;
		for(ll i=0;i<n;i+=2) {
			if(A[v[i]] == A[v[i+1]]) bad = 1;
			p.eb(min(v[i],v[i+1]), max(v[i],v[i+1]));
		}
		if(bad) continue;
		ll sum = 0;
		FOR(i,0,n/2-1) FOR(j,i+1,n/2-1) {
			vector<ll> C = {p[i].f, p[i].s, p[j].f, p[j].s};
			sort(all(C));
			for(auto&i:C)i=A[i];
			if(C[0] == C[3] || C[0] == C[1]) ++ sum;
		}
		ans = max(ans, sum);
	} while(next_permutation(all(v)));
	cout<<ans<<'\n';
}

Subtask #1
0.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 10 ms 492 KB Output is correct
5 Correct 754 ms 492 KB Output is correct
6 Execution timed out 2004 ms 492 KB Time limit exceeded
7 Halted 0 ms 0 KB -

Subtask #2
0.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 10 ms 492 KB Output is correct
5 Correct 754 ms 492 KB Output is correct
6 Execution timed out 2004 ms 492 KB Time limit exceeded
7 Halted 0 ms 0 KB -

Subtask #3
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 10 ms 492 KB Output is correct
5 Correct 754 ms 492 KB Output is correct
6 Execution timed out 2004 ms 492 KB Time limit exceeded
7 Halted 0 ms 0 KB -

Subtask #4
0.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 10 ms 492 KB Output is correct
5 Correct 754 ms 492 KB Output is correct
6 Execution timed out 2004 ms 492 KB Time limit exceeded
7 Halted 0 ms 0 KB -