oj.uz

Submission #757424

# Submission time Handle Problem Language Result Execution time Memory
757424 2023-06-13T07:24:28 Z The_Samurai Vim (BOI13_vim) C++17
50 / 100
 2000 ms 524288 KB 
#include "bits/stdc++.h"

using namespace std;

int INF = 1e9;

int main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    clock_t startTime = clock();
    int n;
    string s;
    cin >> n >> s;
    vector<vector<int>> pos(150);
    vector<int> not_e;
    for (int i = 0; i < n; i++) {
        pos[s[i]].emplace_back(i);
        if (s[i] != 'e') {
            not_e.emplace_back(i);
        }
    }
    if (pos['e'].empty()) {
        cout << 0;
        return 0;
    }
    auto cnt = [&](int l, int r, char x) {
        return upper_bound(pos[x].begin(), pos[x].end(), r) - lower_bound(pos[x].begin(), pos[x].end(), l);
    };
    vector<vector<int>> dist(n, vector<int>(n, INF));
    auto dist_calc = [&](int l, int r) {
        int ans = INF;
        for (char x = 'a'; x <= 'z'; x++) {
            if (x == 'e' or pos[x].empty() or pos[x].back() < r) continue;
            int first = *lower_bound(pos[x].begin(), pos[x].end(), r);
            int now = cnt(l + 1, first, x) * 2;
            now += first - r;
            ans = min(ans, now);
        }
        return min(ans, dist[l][r]);
    };

    for (int i = 0; i < n; i++) {
        for (int j = i; j < n; j++) {
            dist[i][j] = dist_calc(i, j);
        }
    }
    for (int k = 0; k < n; k++) {
        for (int i = 0; i < n; i++) {
            for (int j = i; j < n; j++) {
                if (i <= k and k <= j) {
                     dist[i][j] = min(dist[i][j], dist[i][k] + dist[k][j]);
                }
            }
        }
    }
    vector<vector<int>> dp(pos['e'].size(), vector<int>(pos['e'].size(), INF));
    for (int i = 0; i < dp.size(); i++) {
        // birinchi i ta 'e' ni o'chirish
        for (int j = 0; j <= i; j++) {
            // birinchi i ta 'e' ni o'chirib, j-'e' da to'xtash
            if (j == 0) {
                int now = dist_calc(0, pos['e'][i]);
                // orasida hammasi bilan yurib chiqish
                now += pos['e'][i] - pos['e'][0];
                // 'e' larni o'chirish
                now += i + 1;
                dp[i][j] = now;
                continue;
                // bu qismi to'g'ri
            }
            for (int k = 0; k < j; k++) {
                int now = dp[j - 1][k] + dist_calc(*lower_bound(not_e.begin(), not_e.end(), pos['e'][k]), pos['e'][i]);
                now += pos['e'][i] - pos['e'][j];
                now += i - j + 1;
                dp[i][j] = min(dp[i][j], now);
            }
        }
    }
    // i = 2, j = 2, k = 0
    cout << *min_element(dp.back().begin(), dp.back().end());


#ifdef sunnitov
    cerr << "\nTime: " << (int)((double)(clock() - startTime) / CLOCKS_PER_SEC * 1000);
#endif
}

/*
 chefeddiefedjeffeachbigagedegghehad - 0
 chefeddiefedjeffeachbigagedegghehad - 0

*/

Compilation message

vim.cpp: In function 'int main()':
vim.cpp:56:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |     for (int i = 0; i < dp.size(); i++) {
      |                     ~~^~~~~~~~~~~
vim.cpp:9:13: warning: unused variable 'startTime' [-Wunused-variable]
    9 |     clock_t startTime = clock();
      |             ^~~~~~~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 821 ms 1604 KB Output is correct
2 Correct 238 ms 1236 KB Output is correct
3 Correct 166 ms 1056 KB Output is correct
4 Correct 269 ms 1116 KB Output is correct
5 Correct 321 ms 1012 KB Output is correct
6 Correct 709 ms 1612 KB Output is correct
7 Correct 498 ms 1432 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 824 ms 1700 KB Output is correct
14 Correct 235 ms 1240 KB Output is correct
15 Correct 164 ms 956 KB Output is correct
16 Correct 224 ms 1212 KB Output is correct
17 Correct 273 ms 1400 KB Output is correct
18 Correct 222 ms 1084 KB Output is correct
19 Correct 183 ms 952 KB Output is correct
20 Correct 231 ms 1100 KB Output is correct
21 Correct 270 ms 1108 KB Output is correct
22 Correct 324 ms 1136 KB Output is correct
23 Correct 160 ms 1264 KB Output is correct
24 Correct 152 ms 1112 KB Output is correct
25 Correct 157 ms 1088 KB Output is correct
26 Correct 192 ms 1168 KB Output is correct
27 Correct 434 ms 1364 KB Output is correct
28 Correct 718 ms 1528 KB Output is correct
29 Correct 479 ms 1532 KB Output is correct
30 Correct 190 ms 1312 KB Output is correct
31 Correct 151 ms 1100 KB Output is correct
32 Correct 200 ms 1292 KB Output is correct
33 Correct 224 ms 1316 KB Output is correct
34 Correct 361 ms 1112 KB Output is correct
35 Correct 511 ms 1368 KB Output is correct
36 Correct 503 ms 1476 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2069 ms 95824 KB Time limit exceeded
2 Execution timed out 2076 ms 98388 KB Time limit exceeded
3 Execution timed out 2064 ms 31060 KB Time limit exceeded
4 Execution timed out 2058 ms 95820 KB Time limit exceeded
5 Execution timed out 2070 ms 95724 KB Time limit exceeded
6 Execution timed out 2061 ms 97868 KB Time limit exceeded
7 Execution timed out 2074 ms 96952 KB Time limit exceeded
8 Execution timed out 2054 ms 94544 KB Time limit exceeded
9 Execution timed out 2080 ms 98328 KB Time limit exceeded
10 Execution timed out 2080 ms 98380 KB Time limit exceeded

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Runtime error 202 ms 524288 KB Execution killed with signal 9
2 Runtime error 196 ms 524288 KB Execution killed with signal 9
3 Runtime error 258 ms 524288 KB Execution killed with signal 9
4 Runtime error 192 ms 524288 KB Execution killed with signal 9
5 Runtime error 197 ms 524288 KB Execution killed with signal 9
6 Runtime error 193 ms 524288 KB Execution killed with signal 9
7 Runtime error 189 ms 524288 KB Execution killed with signal 9
8 Runtime error 191 ms 524288 KB Execution killed with signal 9
9 Runtime error 196 ms 524288 KB Execution killed with signal 9
10 Runtime error 190 ms 524288 KB Execution killed with signal 9
11 Runtime error 189 ms 524288 KB Execution killed with signal 9
12 Runtime error 215 ms 524288 KB Execution killed with signal 9
13 Runtime error 196 ms 524288 KB Execution killed with signal 9
14 Runtime error 197 ms 524288 KB Execution killed with signal 9
15 Runtime error 192 ms 524288 KB Execution killed with signal 9
16 Runtime error 193 ms 524288 KB Execution killed with signal 9
17 Runtime error 204 ms 524288 KB Execution killed with signal 9
18 Runtime error 198 ms 524288 KB Execution killed with signal 9
19 Runtime error 188 ms 524288 KB Execution killed with signal 9
20 Runtime error 217 ms 524288 KB Execution killed with signal 9