Submission #213507

#	Time	Username	Problem	Language	Result	Execution time	Memory
213507		tatyam	Miners (IOI07_miners)	C++17	100 / 100	434 ms	632 KiB

miners

#include <bits/stdc++.h>
using namespace std;
const int INF = 0x3fffffff;
#define all(a) begin(a), end(a)
#define each(i,a) for(auto&& i : a)
#define rep(n) for(int i = 0; i < (n); ++i)
template<class T, class U> bool chmax(T& a, const U& b){ if(a < b){ a = b; return 1; } return 0; }
 
inline constexpr int kinds(int a, int b, int c){
    if(a > b) swap(a, b);
    if(b > c) swap(b, c);
    if(a > b) swap(a, b);
    int ans = 3;
    if(!a || a == b) ans--;
    if(!b || b == c) ans--;
    return ans;
}
int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    string s;
    cin >> s >> s;
    each(i, s){
        if(i == 'B') i = 1;
        else if(i == 'F') i = 2;
        else i = 3;
    }
    vector<int> dp1(1 << 8, -INF);
    dp1[0] = 0;
    each(c, s){
        vector<int> dp2(1 << 8, -INF);
        rep(1 << 8){
            int a1 = i >> 6 & 3, a2 = i >> 4 & 3, b1 = i >> 2 & 3, b2 = i & 3;
            int j = a2 << 6 | c << 4 | b1 << 2 | b2;
            chmax(dp2[j], dp1[i] + kinds(a1, a2, c));
            j = a1 << 6 | a2 << 4 | b2 << 2 | c;
            chmax(dp2[j], dp1[i] + kinds(b1, b2, c));
        }
        swap(dp1, dp2);
    }
    cout << *max_element(all(dp1)) << 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