Submission #843647

#	Time	Username	Problem	Language	Result	Execution time	Memory
843647		ZeroCool	Miners (IOI07_miners)	C++14	100 / 100	652 ms	254800 KiB

miners

#include <bits/stdc++.h>

using namespace std;

#define int long long

#define pb push_back
#define mp make_pair
#define mt make_tuple
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()

using ll = long long;
using ld = long double;
 
void solve(int T);
void pre();
 
const int N = 1e5 + 5;
const int M = 405;
const int SQRT = 500;
const int LOG = 20;
const int INF = 1e18;
const int MOD = 1e9+7;
const ld EPS = 1e-9;

void pre(){
	#ifdef ONLINE_JUDGE
    ios::sync_with_stdio(false);
    cin.tie(0);
	#endif
	
}

int32_t main(){
	pre();
	int tt = 1;
	//cin>>tt;
	for(int i = 1;i<=tt;i++){
		cerr<<"Case "<<i<<": "<<endl;
		solve(i);
	}
    return 0;
}

int n;
string s;

int dp[N][4][4][4][4];
bool vis[N][4][4][4][4];

int f(int i,int a,int b,int c,int d){
    if(i == n)return 0;
    if(vis[i][a][b][c][d])return dp[i][a][b][c][d];
    vis[i][a][b][c][d] = true;

    int x = 0;

    if(s[i] == 'M')x = 1;
    else if(s[i] =='F')x = 2;
    else x = 3;

    set<int> s;
    s.insert(a);
    s.insert(b);
    s.insert(x);
    int unq1 = s.size();
    if(a == 0 || b == 0)unq1--;
    s.clear();
    s.insert(c);
    s.insert(d);
    s.insert(x);
    int unq2 = s.size();
    if(c == 0 || d == 0)unq2--;

    int ans = max(f(i+1,b,x,c,d) + unq1, f(i+1,a,b,d,x) + unq2);
    dp[i][a][b][c][d] = ans;
    return ans;

}

void solve(int T){
    cin>>n>>s;

    cout<<f(0,0,0,0,0)<<endl;
}

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 9 / 9
• Subtask 6: 7 / 7
• Subtask 7: 8 / 8
• Subtask 8: 8 / 8
• Subtask 9: 8 / 8
• Subtask 10: 8 / 8
• Subtask 11: 8 / 8
• Subtask 12: 8 / 8