oj.uz

Submission #296372

# Submission time Handle Problem Language Result Execution time Memory
296372 2020-09-10T13:57:33 Z Mlxa Monochrome Points (JOI20_monochrome) C++14
35 / 100
 1072 ms 3444 KB 
#ifdef LC
#include "pch.h"
#else
#include <bits/stdc++.h>
#endif
using namespace std;
#define all(x) x.begin(), x.end()
#define x first
#define y second

const int INPUT_BUF = 1 << 12;
const int OUTPUT_BUF = 1 << 16;
char input[INPUT_BUF];
char output[OUTPUT_BUF];
int input_ptr = 0;
int input_len = 0;
int output_ptr = 0;

inline
bool check_eof() {
    if (input_ptr == input_len) {
        input_ptr = 0;
        input_len = fread(input, 1, INPUT_BUF, stdin);
    }
    return input_ptr == input_len;
}
inline
char get_char() {
    assert(!check_eof());
    return input[input_ptr++];
}
inline
char read_char() {
    char c = get_char();
    while (c <= ' ') {
        c = get_char();
    }
    return c;
}
inline
int read_int() {
    int sgn = +1;
    char c = read_char();
    if (c == '-') {
        sgn = -1;
        c = get_char();
    }
    int x = 0;
    while ('0' <= c && c <= '9') {
        x = 10 * x + c - '0';
        c = get_char();
    }
    return x * sgn;

}
inline
__attribute__((destructor))
void flush_output() {
    fwrite(output, 1, output_ptr, stdout);
    output_ptr = 0;
}
inline
void write(char c) {
    if (output_ptr == OUTPUT_BUF) {
        flush_output();
    }
    output[output_ptr++] = c;
}
inline
void write(signed x) {
    static const int LEN = 20;
    static char tmp[LEN];
    int n = 0;
    if (x < 0) {
        write('-');
        x *= -1;
    }
    while (!n || x) {
        tmp[n++] = (char)(x % 10 + '0');
        x /= 10;
    }
    while (n--) {
        write(tmp[n]);
    }
}
inline
void write(long long x) {
    static const int LEN = 20;
    static char tmp[LEN];
    int n = 0;
    if (x < 0) {
        write('-');
        x *= -1;
    }
    while (!n || x) {
        tmp[n++] = (char)(x % 10 + '0');
        x /= 10;
    }
    while (n--) {
        write(tmp[n]);
    }
}
inline
void write(string s) {
    for (char c : s) {
        write(c);
    }
}
inline
void write(const char *s) {
    for (const char *ptr = s; *ptr; ++ptr) {
        write(*ptr);
    }
}

const int N = 2e5 + 10;
int n;
char s[N];
vector<int> g[2];
int fen[N];
void clear() {
    fill_n(fen, N, 0);
}
void add(int i) {
    for (; i < N; i |= i + 1) {
        ++fen[i];
    }
}
int sum(int i) {
    int s = 0;
    for (; i >= 0; i = (i & (i + 1)) - 1) {
        s += fen[i];
    }
    return s;
}
int go[N];
int func(int k) {
    int s = 0;
    for (int i = 0; i < (int)g[0].size(); ++i) {
        int j = (i + k) % (int)g[1].size();
        go[g[0][i]] = g[1][j];
        go[g[1][j]] = g[0][i];
    }
    clear();
    for (int i = n - 1; i >= 0; --i) {
        if (go[i] <= i) {
            s += sum(i) - sum(go[i]);
            add(go[i]);
        }
    }
    clear();
    for (int i = 0; i < n; ++i) {
        if (i <= go[i]) {
            s += sum(go[i]) - sum(i);
            add(go[i]);
        }
    }
    return -(s / 2);
}
int der(int k) {
    return func((k + 1) % n) - func(k);
}

int32_t main() {
#ifdef LC
    assert(freopen("input.txt", "r", stdin));
    //assert(freopen("output.txt", "w", stdout));
#endif
    ios::sync_with_stdio(0); cin.tie(0);
    
    n = read_int();
    n *= 2;
    for (int i = 0; i < n; ++i) {
        if ((s[i] = read_char()) == 'W') {
            g[0].push_back(i);
        } else {
            g[1].push_back(i);
        }
    }
    for (int i = 0; i < n / 2; ++i) {
        cerr << func(i) << " ";
    }
    cerr << endl;
    
    int ans = min(func(0), func(n / 2 - 1));
    if (n <= 4) {
        ans = 0;
        for (int i = 0; i < n / 2; ++i) {
            ans = min(ans, func(i));
        }
    } else if (der(0) < 0) {
        int lef = 0, rig = n / 2 - 1;
        int bound = max(func(lef), func(rig));
        while (rig - lef > 1) {
            int mid = (lef + rig) / 2;
            if (der(mid) < 0 && func(mid) <= bound) {
                lef = mid;
            } else {
                rig = mid;
            }
        }
        ans = min(ans, func(rig));
    } else {
        int lef = 0, rig = n / 2 - 1;
        int bound = min(func(lef), func(rig));
        while (rig - lef > 1) {
            int mid = (lef + rig) / 2;
            if (der(mid) < 0 || func(mid) >= bound) {
                lef = mid; 
            } else {
                rig = mid;
            }
        }
        ans = min(ans, func(rig));
    }
    ans *= -1;
    write(ans);
    write('\n');
    return 0;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1152 KB Output is correct
2 Correct 2 ms 1152 KB Output is correct
3 Correct 6 ms 1152 KB Output is correct
4 Correct 4 ms 1152 KB Output is correct
5 Correct 5 ms 1152 KB Output is correct
6 Correct 5 ms 1152 KB Output is correct
7 Correct 5 ms 1152 KB Output is correct
8 Correct 5 ms 1152 KB Output is correct
9 Correct 5 ms 1152 KB Output is correct
10 Correct 5 ms 1152 KB Output is correct
11 Correct 5 ms 1152 KB Output is correct
12 Correct 5 ms 1152 KB Output is correct
13 Correct 5 ms 1152 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1152 KB Output is correct
2 Correct 2 ms 1152 KB Output is correct
3 Correct 6 ms 1152 KB Output is correct
4 Correct 4 ms 1152 KB Output is correct
5 Correct 5 ms 1152 KB Output is correct
6 Correct 5 ms 1152 KB Output is correct
7 Correct 5 ms 1152 KB Output is correct
8 Correct 5 ms 1152 KB Output is correct
9 Correct 5 ms 1152 KB Output is correct
10 Correct 5 ms 1152 KB Output is correct
11 Correct 5 ms 1152 KB Output is correct
12 Correct 5 ms 1152 KB Output is correct
13 Correct 5 ms 1152 KB Output is correct
14 Correct 80 ms 1272 KB Output is correct
15 Correct 77 ms 1152 KB Output is correct
16 Correct 98 ms 1272 KB Output is correct
17 Correct 79 ms 1152 KB Output is correct
18 Correct 65 ms 1152 KB Output is correct
19 Correct 97 ms 1152 KB Output is correct
20 Correct 71 ms 1152 KB Output is correct
21 Correct 68 ms 1152 KB Output is correct
22 Correct 66 ms 1152 KB Output is correct
23 Correct 52 ms 1196 KB Output is correct
24 Correct 71 ms 1152 KB Output is correct
25 Correct 67 ms 1200 KB Output is correct
26 Correct 68 ms 1152 KB Output is correct
27 Correct 72 ms 1200 KB Output is correct
28 Correct 77 ms 1152 KB Output is correct
29 Correct 72 ms 1152 KB Output is correct
30 Correct 73 ms 1272 KB Output is correct
31 Correct 79 ms 1200 KB Output is correct
32 Correct 74 ms 1152 KB Output is correct
33 Correct 79 ms 1152 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1152 KB Output is correct
2 Correct 2 ms 1152 KB Output is correct
3 Correct 6 ms 1152 KB Output is correct
4 Correct 4 ms 1152 KB Output is correct
5 Correct 5 ms 1152 KB Output is correct
6 Correct 5 ms 1152 KB Output is correct
7 Correct 5 ms 1152 KB Output is correct
8 Correct 5 ms 1152 KB Output is correct
9 Correct 5 ms 1152 KB Output is correct
10 Correct 5 ms 1152 KB Output is correct
11 Correct 5 ms 1152 KB Output is correct
12 Correct 5 ms 1152 KB Output is correct
13 Correct 5 ms 1152 KB Output is correct
14 Correct 80 ms 1272 KB Output is correct
15 Correct 77 ms 1152 KB Output is correct
16 Correct 98 ms 1272 KB Output is correct
17 Correct 79 ms 1152 KB Output is correct
18 Correct 65 ms 1152 KB Output is correct
19 Correct 97 ms 1152 KB Output is correct
20 Correct 71 ms 1152 KB Output is correct
21 Correct 68 ms 1152 KB Output is correct
22 Correct 66 ms 1152 KB Output is correct
23 Correct 52 ms 1196 KB Output is correct
24 Correct 71 ms 1152 KB Output is correct
25 Correct 67 ms 1200 KB Output is correct
26 Correct 68 ms 1152 KB Output is correct
27 Correct 72 ms 1200 KB Output is correct
28 Correct 77 ms 1152 KB Output is correct
29 Correct 72 ms 1152 KB Output is correct
30 Correct 73 ms 1272 KB Output is correct
31 Correct 79 ms 1200 KB Output is correct
32 Correct 74 ms 1152 KB Output is correct
33 Correct 79 ms 1152 KB Output is correct
34 Correct 902 ms 1240 KB Output is correct
35 Correct 1072 ms 1272 KB Output is correct
36 Correct 871 ms 1400 KB Output is correct
37 Correct 808 ms 1368 KB Output is correct
38 Correct 748 ms 1280 KB Output is correct
39 Correct 767 ms 1152 KB Output is correct
40 Correct 709 ms 1248 KB Output is correct
41 Correct 721 ms 1244 KB Output is correct
42 Correct 832 ms 1400 KB Output is correct
43 Correct 810 ms 1236 KB Output is correct
44 Correct 734 ms 1400 KB Output is correct
45 Correct 758 ms 1228 KB Output is correct
46 Correct 825 ms 1272 KB Output is correct
47 Correct 792 ms 1272 KB Output is correct
48 Correct 789 ms 1272 KB Output is correct
49 Correct 685 ms 1272 KB Output is correct
50 Correct 778 ms 1272 KB Output is correct
51 Correct 797 ms 1152 KB Output is correct
52 Correct 789 ms 1152 KB Output is correct

Subtask #4
0.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1152 KB Output is correct
2 Correct 2 ms 1152 KB Output is correct
3 Correct 6 ms 1152 KB Output is correct
4 Correct 4 ms 1152 KB Output is correct
5 Correct 5 ms 1152 KB Output is correct
6 Correct 5 ms 1152 KB Output is correct
7 Correct 5 ms 1152 KB Output is correct
8 Correct 5 ms 1152 KB Output is correct
9 Correct 5 ms 1152 KB Output is correct
10 Correct 5 ms 1152 KB Output is correct
11 Correct 5 ms 1152 KB Output is correct
12 Correct 5 ms 1152 KB Output is correct
13 Correct 5 ms 1152 KB Output is correct
14 Correct 80 ms 1272 KB Output is correct
15 Correct 77 ms 1152 KB Output is correct
16 Correct 98 ms 1272 KB Output is correct
17 Correct 79 ms 1152 KB Output is correct
18 Correct 65 ms 1152 KB Output is correct
19 Correct 97 ms 1152 KB Output is correct
20 Correct 71 ms 1152 KB Output is correct
21 Correct 68 ms 1152 KB Output is correct
22 Correct 66 ms 1152 KB Output is correct
23 Correct 52 ms 1196 KB Output is correct
24 Correct 71 ms 1152 KB Output is correct
25 Correct 67 ms 1200 KB Output is correct
26 Correct 68 ms 1152 KB Output is correct
27 Correct 72 ms 1200 KB Output is correct
28 Correct 77 ms 1152 KB Output is correct
29 Correct 72 ms 1152 KB Output is correct
30 Correct 73 ms 1272 KB Output is correct
31 Correct 79 ms 1200 KB Output is correct
32 Correct 74 ms 1152 KB Output is correct
33 Correct 79 ms 1152 KB Output is correct
34 Correct 902 ms 1240 KB Output is correct
35 Correct 1072 ms 1272 KB Output is correct
36 Correct 871 ms 1400 KB Output is correct
37 Correct 808 ms 1368 KB Output is correct
38 Correct 748 ms 1280 KB Output is correct
39 Correct 767 ms 1152 KB Output is correct
40 Correct 709 ms 1248 KB Output is correct
41 Correct 721 ms 1244 KB Output is correct
42 Correct 832 ms 1400 KB Output is correct
43 Correct 810 ms 1236 KB Output is correct
44 Correct 734 ms 1400 KB Output is correct
45 Correct 758 ms 1228 KB Output is correct
46 Correct 825 ms 1272 KB Output is correct
47 Correct 792 ms 1272 KB Output is correct
48 Correct 789 ms 1272 KB Output is correct
49 Correct 685 ms 1272 KB Output is correct
50 Correct 778 ms 1272 KB Output is correct
51 Correct 797 ms 1152 KB Output is correct
52 Correct 789 ms 1152 KB Output is correct
53 Runtime error 6 ms 3444 KB Execution killed with signal 11
54 Halted 0 ms 0 KB -