Submission #396674

#	Time	Username	Problem	Language	Result	Execution time	Memory
396674		MarcoMeijer	Miners (IOI07_miners)	C++14	100 / 100	625 ms	628 KiB

miners

#include <bits/stdc++.h>
using namespace std;
 
// macros
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> lll;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<ll> vll;
typedef vector<lll> vlll;
#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define RE(a,c) REP(a,0,c)
#define RE1(a,c) REP(a,1,c+1)
#define REI(a,b,c) REP(a,b,c+1)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define FOR(a,b) for(auto& a : b)
#define all(a) a.begin(), a.end()
#define INF 1e18
#define EPS 1e-9
#define pb push_back
#define popb pop_back
#define fi first
#define se second
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
 
// input
template<class T> void IN(T& x) {cin >> x;}
template<class H, class... T> void IN(H& h, T&... t) {IN(h); IN(t...); }
 
// output
template<class T1, class T2> void OUT(const pair<T1,T2>& x);
template<class T> void OUT(const vector<T>& x);
template<class T> void OUT(const T& x) {cout << x;}
template<class H, class... T> void OUT(const H& h, const T&... t) {OUT(h); OUT(t...); }
template<class T1, class T2> void OUT(const pair<T1,T2>& x) {OUT(x.fi,' ',x.se);}
template<class T> void OUT(const vector<T>& x) {RE(i,x.size()) OUT(i==0?"":" ",x[i]);}
template<class... T> void OUTL(const T&... t) {OUT(t..., "\n"); }
template<class H> void OUTLS(const H& h) {OUTL(h); }
template<class H, class... T> void OUTLS(const H& h, const T&... t) {OUT(h,' '); OUTLS(t...); }
 
// dp
template<class T> bool ckmin(T&a, const T&b) { bool bl = a > b; a = min(a,b); return bl;}
template<class T> bool ckmax(T&a, const T&b) { bool bl = a < b; a = max(a,b); return bl;}
 
void program();
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    program();
}
 
 
//===================//
//   begin program   //
//===================//
 
const int MX = 1e5+2;
const int N = (1<<20);

int n, m=0;
string s;
int f[4][4][4];
int profit[45][4];
int nextF[45][4];

int countDif(vi f) {
    set<int> s;
    FOR(i,f) s.insert(i);
    return s.size();
}
void preCalc() {
    f[0][0][0] = m++;
    RE1(i,3) f[i][0][0] = m++;
    RE1(i,3) RE1(j,3) f[i][j][0] = m++;
    RE1(i,3) RE1(j,3) RE1(k,3) f[i][j][k] = m++;

    RE1(l,3) {
        profit[f[0][0][0]][l] = 1;
        RE1(i,3) profit[f[i][0][0]][l] = countDif({l,i});
        RE1(i,3) RE1(j,3) profit[f[i][j][0]][l] = countDif({l,i,j});
        RE1(i,3) RE1(j,3) RE1(k,3) profit[f[i][j][k]][l] = countDif({l,i,j});
    }

    RE1(l,3) {
        nextF[f[0][0][0]][l] = f[l][0][0];
        RE1(i,3) nextF[f[i][0][0]][l] = f[l][i][0];
        RE1(i,3) RE1(j,3) nextF[f[i][j][0]][l] = f[l][i][j];
        RE1(i,3) RE1(j,3) RE1(k,3) nextF[f[i][j][k]][l] = f[l][i][j];
    }
}

int dp[2][45][45];

void program() {
    IN(n,s);

    FOR(c,s) {
        if(c == 'M') c = 1;
        if(c == 'F') c = 2;
        if(c == 'B') c = 3;
    }

    preCalc();

    memset(dp,-1,sizeof(dp));
    dp[0][0][0] = 0;

    int ans = 0;
    RE(i,n) {
        int c = s[i];
        RE(j,m) RE(k,m) {
            if(dp[i%2][j][k] == -1) continue;
            ckmax(dp[(i+1)%2][nextF[j][c]][k], profit[j][c] + dp[i%2][j][k]);
            ckmax(dp[(i+1)%2][j][nextF[k][c]], profit[k][c] + dp[i%2][j][k]);
            ckmax(ans, profit[j][c] + dp[i%2][j][k]);
            ckmax(ans, profit[k][c] + dp[i%2][j][k]);
        }
        RE(j,m) RE(k,m) dp[i%2][j][k] = -1;
    }
    OUTL(ans);
}

• 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