Submission #760316

#	Time	Username	Problem	Language	Result	Execution time	Memory
760316		bane	Miners (IOI07_miners)	C++17	100 / 100	161 ms	516 KiB

miners

#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <chrono>
#include <cmath>
#include <complex>
#include <cstring>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <unordered_set>
#include <vector>
#include <climits>
#include <list>
using namespace std;
       
using ll = long long;
using db = long double; // or double, if TL is tight
using llu = unsigned long long;
using str = string; // yay python! 
       
// pairs
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using pdb = pair<db,db>;
#define mp make_pair
#define fr first
#define sc second
       
#define tcT template<class T
#define tcTU tcT, class U
// ^ lol this makes everything look weird but I'll try it
tcT> using V = vector<T>; 
tcT, size_t SZ> using AR = array<T,SZ>; 
using vi = V<int>;
using vb = V<bool>;
using vl = V<ll>;
using vd = V<db>;
using vs = V<str>;
using vpi = V<pii>;
using vpl = V<pll>;
using vpd = V<pdb>;
#define ms0(x) memset(x , 0, sizeof(x))
// vectors
// oops size(x), rbegin(x), rend(x) need C++17
#define sz(x) int((x).size())
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define rall(x) x.rbegin(), x.rend() 
#define sor(x) sort(all(x)) 
#define rsz resize
#define ins insert 
#define pb push_back
#define eb emplace_back
#define ft front()
#define bk back()
       
#define lb lower_bound
#define ub upper_bound
tcT> int lwb(V<T>& a, const T& b) { return int(lb(all(a),b)-bg(a)); }
tcT> int upb(V<T>& a, const T& b) { return int(ub(all(a),b)-bg(a)); }
       
// loops
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define rep(a) F0R(_,a)
#define each(a,x) for (auto& a: x)
       
const int MOD = (int)1e9+7; // 998244353;
const int MX = (int)2e5+5;
const ll BIG = 1e18; // not too close to LLONG_MAX
const db PI = acos((db)-1);
inline namespace FileIO {
    void setIn(str s)  { freopen(s.c_str(),"r",stdin); }
    void setOut(str s) { freopen(s.c_str(),"w",stdout); }
    void setIO(str s = "") {
        cin.tie(0)->sync_with_stdio(0); // unsync C / C++ I/O streams
        // cin.exceptions(cin.failbit);
        // throws exception when do smth illegal
        // ex. try to read letter into int
        if (sz(s)) setIn(s+".in"), setOut(s+".out"); // for old USACO
    }
}
       
const int dx[4] = {0,1,0,-1};
const int dy[4] = {-1,0,1,0};
int main() {
    setIO("");
    int n;
    cin >> n;
    int dp[2][2][4][4][4][4];
    string s;
    cin >> s;
    memset(dp, -1, sizeof(dp));
    map<char,int>mapa;
    mapa['M'] = 1;
    mapa['B'] = 2;
    mapa['F'] = 3;
    dp[0][0][0][0][0][0] = 0;
    dp[1][0][0][0][0][0] = 0;
    dp[1][1][mapa[s[0]]][0][0][0] = 1;
    dp[1][0][mapa[s[0]]][0][0][0] = 1;
    for (int i = 1; i<=n; i++){
        int x = mapa[s[i - 1]];
        //place on the right
        //kade
        for (int j = 0; j<2; j++){
            for (int l = 1; l<=3; l++){
                for (int p = 0; p<=3; p++){
                    for (int k = 0; k<=3; k++){
                        for (int m = 0; m<=3; m++){
                            if (dp[1 - 1][j][l][p][k][m]==-1)continue;
                            int cnt = 0;
                            if (x == 1 || p == 1|| l == 1)++cnt;
                            if (x == 2 || p == 2 || l == 2)++cnt;
                            if (x == 3 || l == 3 || p== 3)++cnt;
                            dp[1][1][x][l][k][m] = max(dp[1][1][x][l][k][m], 
                                dp[1 - 1][j][l][p][k][m] + cnt
                            );
                        }
                    }
                }
            }
        }
        for (int j = 0; j<2; j++){
            for (int l = 1; l<=3; l++){
                for (int p = 0; p<=3; p++){
                    for (int k = 0; k<=3; k++){
                        for (int m = 0; m<=3; m++){
                            if (dp[0][j][l][p][k][m]==-1)continue;
                            int cnt = 0;
                            if (x == 1 || k == 1|| m == 1)++cnt;
                            if (x == 2 || k == 2 || m == 2)++cnt;
                            if (x == 3 || k == 3 || m == 3)++cnt;
                            dp[1][0][l][p][x][k] = max(dp[1][0][l][p][x][k], 
                                dp[1 - 1][j][l][p][k][m] + cnt
                            );
                        }
                    }
                }
            }
        }
        for (int j = 0; j<2; j++){
            for (int l = 1; l<=3; l++){
                for (int p = 0; p<=3; p++){
                    for (int k = 0; k<=3; k++){
                        for (int m = 0; m<=3; m++){
                            dp[0][j][l][p][k][m] = dp[1][j][l][p][k][m];
                        }
                    }
                }
            }
        }
    }
    int best = 0;
         
    for (int j = 0; j<2; j++){   
        for (int l = 1; l<=3; l++){
            for (int p = 0; p<=3; p++){
                for (int k = 0; k<=3; k++){
                    for (int m = 0; m<=3; m++){
                        best = max(best, dp[1][j][l][p][k][m]);
                    }
                }
            }
        }
    }
    cout<<best;
}

Compilation message (stderr)

miners.cpp: In function 'void FileIO::setIn(str)':
miners.cpp:82:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |     void setIn(str s)  { freopen(s.c_str(),"r",stdin); }
      |                          ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
miners.cpp: In function 'void FileIO::setOut(str)':
miners.cpp:83:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |     void setOut(str s) { freopen(s.c_str(),"w",stdout); }
      |                          ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• 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