Submission #159799

#	Time	Username	Problem	Language	Result	Execution time	Memory
159799		karma	Miners (IOI07_miners)	C++14	100 / 100	137 ms	100852 KiB

miners

#include<bits/stdc++.h>
#define FileName      "test"
#define ll            long long
#define pb            emplace_back
#define fi            first
#define se            second
#define mp            make_pair

using namespace std;

typedef pair<ll, ll> pii;
const int N = int(1e5) + 5;

int f[N][4][4][4][4];
int cost[4][4][4], n, c;
string s;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if(fopen(FileName".inp", "r")) {
       freopen(FileName".inp", "r", stdin);
       freopen(FileName".out", "w", stdout);
    }
    cin >> n >> s;
    for(int i = 0; i < 4; ++i) {
        for(int j = 0; j < 4; ++j) {
            for(int k = 0; k < 4; ++k) {
                set<int> s;
                s.insert(i), s.insert(j), s.insert(k), s.erase(0);
                cost[i][j][k] = int(s.size());
            }
        }
    }
    s = ' ' + s;
    memset(&f, -1, sizeof f);
    f[0][0][0][0][0] = 0;
    for(int i = 1; i <= n; ++i) {
       if(s[i] == 'B') c = 1;
       else if(s[i] == 'M') c = 2;
       else if(s[i] == 'F') c = 3;
       for(int j = 0; j < 4; ++j) {
          for(int k = 0; k < 4; ++k) {
             for(int t = 0; t < 4; ++t) {
                for(int l = 0; l < 4; ++l) {
                    if(f[i - 1][j][k][t][l] == -1) continue;
                    f[i][j][k][l][c] = max(f[i][j][k][l][c], f[i - 1][j][k][t][l] + cost[t][l][c]);
                    f[i][k][c][t][l] = max(f[i][k][c][t][l], f[i - 1][j][k][t][l] + cost[j][k][c]);
                }
             }
          }
       }
    }
    int res = 0;
    for(int i = 0; i < 4; ++i) {
        for(int j = 0; j < 4; ++j) {
            for(int k = 0; k < 4; ++k) {
                for(int l = 0; l < 4; ++l)
                    res = max(res, f[n][i][j][k][l]);
            }
        }
    }
    cout << res;
}

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:22:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
        freopen(FileName".inp", "r", stdin);
        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
miners.cpp:23:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
        freopen(FileName".out", "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