Submission #445236

#	Time	Username	Problem	Language	Result	Execution time	Memory
445236		JerryLiu06	Miners (IOI07_miners)	C++17	100 / 100	902 ms	100604 KiB

miners

#include <bits/stdc++.h>
 
using namespace std;
 
using ll = long long;
using ld = long double;
using db = double;
using str = string;
 
using pi = pair<int, int>;
using pl = pair<ll, ll>;
using pd = pair<db, db>;
 
using vi = vector<int>;
using vb = vector<bool>;
using vl = vector<ll>;
using vd = vector<db>;
using vs = vector<str>;
using vpi = vector<pi>;
using vpl = vector<pl>;
using vpd = vector<pd>;
 
#define mp make_pair
#define f first
#define s second
 
#define sz(x) (int)(x).size()
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define sor(x) sort(all(x))
#define rsz resize
#define ins insert 
#define ft front()
#define bk back()
#define pb push_back
#define pf push_front
 
#define lb lower_bound
#define ub upper_bound
 
#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 EACH(a, x) for (auto& a : x)
 
ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); }
ll fdiv(ll a, ll b) { return a / b - ((a ^ b) < 0 && a % b); }
 
template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
 
template<class T> void remDup(vector<T>& v) { sor(v); v.erase(unique(all(v)), v.end()); }
 
const int MOD = 1e9 + 7;
const int MX = 1e5 + 10;
const ll INF = 1e18;

int N; int DP[MX][4][4][4][4]; unordered_set<int> cnt;

int numPoints(int A, int B, int C) {
    cnt.clear(); if (A) cnt.insert(A); if (B) cnt.insert(B); if (C) cnt.insert(C); return sz(cnt);
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0);

    cin >> N; memset(DP, -1, sizeof DP); DP[0][0][0][0][0] = 0; // 'M' = 1, 'F' = 2, 'B' = 3

    F0R(i, N) {
        char CH; cin >> CH;

        F0R(A, 4) {
            F0R(B, 4) {
                F0R(C, 4) {
                    F0R(D, 4) {
                        if (DP[i][A][B][C][D] != -1) {
                            int ID; 
                            if (CH == 'M') ID = 1;
                            if (CH == 'F') ID = 2;
                            if (CH == 'B') ID = 3;

                            ckmax(DP[i + 1][ID][A][C][D], DP[i][A][B][C][D] + numPoints(ID, A, B));
                            ckmax(DP[i + 1][A][B][ID][C], DP[i][A][B][C][D] + numPoints(ID, C, D));
                        }
                    }
                }
            }
        }
    }
    int ans = 0;
    F0R(A, 4) {
        F0R(B, 4) {
            F0R(C, 4) {
                F0R(D, 4) {

                    ckmax(ans, DP[N][A][B][C][D]);
                }
            }
        }
    }
    cout << ans;
}

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:51:59: warning: 'ID' may be used uninitialized in this function [-Wmaybe-uninitialized]
   51 | template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
      |                                                         ~~^~~
miners.cpp:78:33: note: 'ID' was declared here
   78 |                             int ID;
      |                                 ^~

• 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