oj.uz

Submission #82915

# Submission time Handle Problem Language Result Execution time Memory
82915 2018-11-02T20:27:12 Z alexpetrescu Snake Escaping (JOI18_snake_escaping) C++14
12 / 100
 294 ms 66560 KB 
#include <cstdio>
#include <algorithm>

#define fin stdin
#define fout stdout
//FILE *fin = fopen("a.in", "r"), *fout = fopen("a.out", "w");

#define MAXN 20
#define MAXL (1 << MAXN)

int n, q, l, cnt[2], a[MAXN], v[MAXN];
int dp0[MAXL], dp1[MAXL];
char u[MAXL + 10], s[MAXN + 10];

inline void solve() {
    fgets(s, MAXN + 5, fin);
    for (int i = 0, j = n - 1; i < j; i++, j--)
        std::swap(s[i], s[j]);
    cnt[0] = cnt[1] = 0;
    for (int i = 0; i < n; i++)
        if (s[i] != '?')
            cnt[s[i] - '0']++;
    v[0] = 0;
    long long ans = 0;
    if (n - cnt[0] - cnt[1] <= cnt[0] && n - cnt[0] - cnt[1] <= cnt[1]) {
        int x = 0;
        for (int i = 0; i < n; i++) {
            if (s[i] == '?')
                v[++v[0]] = i;
            else if (s[i] == '1')
                x += 1 << i;
        }
        for (int i = 1; i <= v[0]; i++)
            a[i] = 0;
        ans = u[x] - '0';
        for (int i = 1; i < (1 << v[0]); i++) {
            int p = 1;
            while (a[p]) {
                x -= 1 << v[p];
                a[p] = 0;
                p++;
            }
            x += 1 << v[p];
            a[p] = 1;
            ans += u[x] - '0';
        }
    } else if (cnt[0] <= cnt[1]) {
        int x = 0;
        for (int i = 0; i < n; i++) {
            if (s[i] == '0')
                v[++v[0]] = i;
            else if (s[i] == '1')
                x += 1 << i;
        }
        for (int i = 0; i < n; i++)
            a[i] = 0;
        ans = dp1[x];
        int S = 1;
        for (int i = 1; i < (1 << v[0]); i++) {
            int p = 1;
            while (a[p]) {
                S = -S;
                x -= 1 << v[p];
                a[p] = 0;
                p++;
            }
            S = -S;
            x += 1 << v[p];
            a[p] = 1;
            ans += S * dp1[x];
        }
    } else {
        int x = l - 1;
        for (int i = 0; i < n; i++) {
            if (s[i] == '1')
                v[++v[0]] = i;
            else if (s[i] == '0')
                x -= 1 << i;
        }
        for (int i = 0; i < n; i++)
            a[i] = 0;
        ans = dp0[x];
        int S = 1;
        for (int i = 1; i < (1 << v[0]); i++) {
            int p = 1;
            while (a[p]) {
                S = -S;
                x += 1 << v[p];
                a[p] = 0;
                p++;
            }
            S = -S;
            x -= 1 << v[p];
            a[p] = 1;
            ans += S * dp0[x];
        }
    }
    fprintf(fout, "%lld\n", ans);
}

int main() {
    fscanf(fin, "%d%d ", &n, &q);
    fgets(u, MAXL + 5, fin);
    l = 1 << n;
    for (int i = 0; i < l; i++)
        dp0[i] = dp1[i] = u[i] - '0';

    for (int i = 0; i < n; i++)
        for (int j = 0; j < l; j++)
            if (!(j & (1 << i)))
                dp1[j] += dp1[j ^ (1 << i)];
    for (int i = 0; i < n; i++)
        for (int j = l - 1; j >= 0; j--)
            if (j & (1 << i))
                dp0[j] += dp0[j ^ (1 << i)];

    for (; q; q--)
        solve();

    fclose(fin);
    fclose(fout);
    return 0;
}

Compilation message

snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:102:11: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     fscanf(fin, "%d%d ", &n, &q);
     ~~~~~~^~~~~~~~~~~~~~~~~~~~~~
snake_escaping.cpp:103:10: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     fgets(u, MAXL + 5, fin);
     ~~~~~^~~~~~~~~~~~~~~~~~
snake_escaping.cpp: In function 'void solve()':
snake_escaping.cpp:16:10: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     fgets(s, MAXN + 5, fin);
     ~~~~~^~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 476 KB Output is correct
3 Correct 2 ms 476 KB Output is correct
4 Correct 2 ms 484 KB Output is correct
5 Correct 2 ms 484 KB Output is correct
6 Correct 2 ms 484 KB Output is correct
7 Correct 2 ms 512 KB Output is correct
8 Correct 2 ms 636 KB Output is correct
9 Correct 2 ms 644 KB Output is correct
10 Correct 2 ms 644 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 476 KB Output is correct
3 Correct 2 ms 476 KB Output is correct
4 Correct 2 ms 484 KB Output is correct
5 Correct 2 ms 484 KB Output is correct
6 Correct 2 ms 484 KB Output is correct
7 Correct 2 ms 512 KB Output is correct
8 Correct 2 ms 636 KB Output is correct
9 Correct 2 ms 644 KB Output is correct
10 Correct 2 ms 644 KB Output is correct
11 Correct 225 ms 15252 KB Output is correct
12 Correct 255 ms 18608 KB Output is correct
13 Correct 240 ms 18608 KB Output is correct
14 Correct 255 ms 18608 KB Output is correct
15 Correct 254 ms 18968 KB Output is correct
16 Correct 294 ms 18968 KB Output is correct
17 Correct 283 ms 28908 KB Output is correct
18 Correct 184 ms 41648 KB Output is correct
19 Correct 182 ms 49536 KB Output is correct
20 Correct 249 ms 61760 KB Output is correct

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 476 KB Output is correct
3 Correct 2 ms 476 KB Output is correct
4 Correct 2 ms 484 KB Output is correct
5 Correct 2 ms 484 KB Output is correct
6 Correct 2 ms 484 KB Output is correct
7 Correct 2 ms 512 KB Output is correct
8 Correct 2 ms 636 KB Output is correct
9 Correct 2 ms 644 KB Output is correct
10 Correct 2 ms 644 KB Output is correct
11 Correct 225 ms 15252 KB Output is correct
12 Correct 255 ms 18608 KB Output is correct
13 Correct 240 ms 18608 KB Output is correct
14 Correct 255 ms 18608 KB Output is correct
15 Correct 254 ms 18968 KB Output is correct
16 Correct 294 ms 18968 KB Output is correct
17 Correct 283 ms 28908 KB Output is correct
18 Correct 184 ms 41648 KB Output is correct
19 Correct 182 ms 49536 KB Output is correct
20 Correct 249 ms 61760 KB Output is correct
21 Runtime error 293 ms 66560 KB Memory limit exceeded: We have a known bug that the memory usage is measured incorrectly (possibly because of Meltdown/Spectre patch), so your solution may be correct. Please submit again. Sorry for the inconvenience.
22 Halted 0 ms 0 KB -

Subtask #4
0 / 53.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 476 KB Output is correct
3 Correct 2 ms 476 KB Output is correct
4 Correct 2 ms 484 KB Output is correct
5 Correct 2 ms 484 KB Output is correct
6 Correct 2 ms 484 KB Output is correct
7 Correct 2 ms 512 KB Output is correct
8 Correct 2 ms 636 KB Output is correct
9 Correct 2 ms 644 KB Output is correct
10 Correct 2 ms 644 KB Output is correct
11 Runtime error 84 ms 66560 KB Memory limit exceeded: We have a known bug that the memory usage is measured incorrectly (possibly because of Meltdown/Spectre patch), so your solution may be correct. Please submit again. Sorry for the inconvenience.
12 Halted 0 ms 0 KB -

Subtask #5
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 476 KB Output is correct
3 Correct 2 ms 476 KB Output is correct
4 Correct 2 ms 484 KB Output is correct
5 Correct 2 ms 484 KB Output is correct
6 Correct 2 ms 484 KB Output is correct
7 Correct 2 ms 512 KB Output is correct
8 Correct 2 ms 636 KB Output is correct
9 Correct 2 ms 644 KB Output is correct
10 Correct 2 ms 644 KB Output is correct
11 Correct 225 ms 15252 KB Output is correct
12 Correct 255 ms 18608 KB Output is correct
13 Correct 240 ms 18608 KB Output is correct
14 Correct 255 ms 18608 KB Output is correct
15 Correct 254 ms 18968 KB Output is correct
16 Correct 294 ms 18968 KB Output is correct
17 Correct 283 ms 28908 KB Output is correct
18 Correct 184 ms 41648 KB Output is correct
19 Correct 182 ms 49536 KB Output is correct
20 Correct 249 ms 61760 KB Output is correct
21 Runtime error 293 ms 66560 KB Memory limit exceeded: We have a known bug that the memory usage is measured incorrectly (possibly because of Meltdown/Spectre patch), so your solution may be correct. Please submit again. Sorry for the inconvenience.
22 Halted 0 ms 0 KB -