Submission #586455

#	Time	Username	Problem	Language	Result	Execution time	Memory
586455		Do_you_copy	Miners (IOI07_miners)	C++14	100 / 100	177 ms	100812 KiB

miners

#include <bits/stdc++.h>
#define taskname "test"
#define fi first
#define se second
#define pb push_back
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
using namespace std;

using ll = long long;
using pii = pair <int, int>;

ll min(const ll &a, const ll &b){
    return (a < b) ? a : b;
}

ll max(const ll &a, const ll &b){
    return (a > b) ? a : b;
}

const ll Mod = 1000000007;
const int maxN = 1e5 + 1;
int n;
int dp[maxN][4][4][4][4];
string s;

int distinct(int a, int b, int c){
    if (a == 0){
        if (b == 0){
            if (c == 0) return 0;
            return 1;
        }
        if (b == c || c == 0) return 1;
        return 2;
    }
    if (b == 0){
        if (c == 0 || a == c) return 1;
        return 2;
    }
    if (c == 0){
        if (a == b) return 1;
        return 2;
    }
    if (a == b && a == c) return 1;
    if (a == b || b == c || a == c) return 2;
    return 3;
}

void operation(int i, int x){
    for (int p = 0; p < 4; ++p){
        for (int q = 0; q < 4; ++q){
            for (int r = 0; r < 4; ++r){
                for (int s = 0; s < 4; ++s){
                    dp[i][q][x][r][s] = max(dp[i][q][x][r][s],
                    dp[i - 1][p][q][r][s] + distinct(p, q, x));
                    dp[i][p][q][s][x] = max(dp[i][p][q][s][x],
                    dp[i - 1][p][q][r][s] + distinct(r, s, x));
                }
            }
        }
    }
}

void Init(){
    cin >> n;
    cin >> s;
    for (int i = 0; i <= n; ++i){
        for (int p = 0; p < 4; ++p){
            for (int q = 0; q < 4; ++q){
                for (int r = 0; r < 4; ++r){
                    for (int s = 0; s < 4; ++s) dp[i][p][q][r][s] = INT_MIN;
                }
            }
        }
    }
    dp[0][0][0][0][0] = 0;
    for (int i = 1; i <= n; ++i){
        if (s[i - 1] == 'M') operation(i, 1);
        if (s[i - 1] == 'F') operation(i, 2);
        if (s[i - 1] == 'B') operation(i, 3);
    }
    int ans = 0;
    for (int p = 0; p < 4; ++p){
        for (int q = 0; q < 4; ++q){
            for (int r = 0; r < 4; ++r){
                for (int s = 0; s < 4; ++s){
                    ans = max(ans, dp[n][p][q][r][s]);
                }
            }
        }
    }
    cout << ans;
}

int main(){
    if (fopen(taskname".txt", "r")){
        freopen(taskname".txt", "r", stdin);
    }
    faster
    //freopen(taskname.inp, "r", stdin)
    //freopen(taskname.out, "w", stdout)
    Init();
}

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:96:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   96 |         freopen(taskname".txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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