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Submission #611541

# Submission time Handle Problem Language Result Execution time Memory
611541 2022-07-29T05:32:59 Z 박상훈(#8496) Ljetopica (COI19_ljetopica) C++17
100 / 100
 124 ms 126900 KB 
#include <bits/stdc++.h>

typedef long long ll;
using namespace std;
const int MOD = 1e9+7;
char a[1010], b[1010], s[1010];
pair<ll, ll> dp[1010][1010][4][2];
int n;
ll pw[1010];

pair<ll, ll> solve(int i, int k, int msk, int R){
    if (msk==-1) return {0, 0};
    if (msk==3 && a[i] > b[i]) return {0, 0};
    if (k<0) return {0, 0};
    if (i==n){
        if (k==0) return {1, 1};
        return {0, 0};
    }

    if (dp[i][k][msk][R].first!=-1) return dp[i][k][msk][R];


    auto &[ret, cnt] = dp[i][k][msk][R];
    ret = 0, cnt = 0;

    int lmsk = 0, rmsk = 0;
    if (msk==0) lmsk = rmsk = 0;
    else if (msk==1){
        if (a[i]=='1') lmsk = -1, rmsk = 1;
        else lmsk = 1, rmsk = 0;
    }
    else if (msk==2){
        if (b[i]=='0') lmsk = 2, rmsk = -1;
        else lmsk = 0, rmsk = 2;
    }
    else{
        if (a[i]=='1') lmsk = -1, rmsk = 3;
        else if (b[i]=='0') lmsk = 3, rmsk = -1;
        else lmsk = 1, rmsk = 2;
    }

    int d = n - i;
    if ((int)(s[i]=='R') == R){ ///going left, not changing
        auto [ret2, cnt2] = solve(i+1, k, lmsk, R);
        cnt += cnt2;
        ret += ret2 + pw[d-1] * cnt2;

        cnt %= MOD, ret %= MOD;
    }
    else{ ///going left, changing
        auto [ret2, cnt2] = solve(i+1, k-1, lmsk, R^1);
        cnt += cnt2;
        ret += ret2 + pw[d-1] * cnt2;

        cnt %= MOD, ret %= MOD;
    }

    if ((int)(s[i]=='L') == R){ ///going right
        auto [ret2, cnt2] = solve(i+1, k, rmsk, R);
        cnt += cnt2;
        ret += ret2 + pw[d] * cnt2;

        cnt %= MOD, ret %= MOD;
    }
    else{
        auto [ret2, cnt2] = solve(i+1, k-1, rmsk, R^1);
        cnt += cnt2;
        ret += ret2 + pw[d] * cnt2;

        cnt %= MOD, ret %= MOD;
    }

    return {ret, cnt};
}

int main(){
    pw[0] = 1;
    for (int i=1;i<1010;i++) pw[i] = pw[i-1] * 2 % MOD;

    int k;
    scanf("%d %d", &n, &k);

    scanf("%s", s+1);
    scanf("%s", a);
    scanf("%s", b);

    for (int i=1;i<=n;i++){
        for (int j=0;j<=k;j++){
            for (int l=0;l<4;l++){
                dp[i][j][l][0].first = -1;
                dp[i][j][l][1].first = -1;
            }
        }
    }

    ll ans = (solve(1, k, 3, 0).first + solve(1, k, 3, 1).first) % MOD;
    printf("%lld\n", ans);
    return 0;
}

Compilation message

ljetopica.cpp: In function 'int main()':
ljetopica.cpp:81:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |     scanf("%d %d", &n, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~
ljetopica.cpp:83:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |     scanf("%s", s+1);
      |     ~~~~~^~~~~~~~~~~
ljetopica.cpp:84:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   84 |     scanf("%s", a);
      |     ~~~~~^~~~~~~~~
ljetopica.cpp:85:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   85 |     scanf("%s", b);
      |     ~~~~~^~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4564 KB Output is correct
2 Correct 2 ms 4436 KB Output is correct
3 Correct 2 ms 4180 KB Output is correct
4 Correct 2 ms 3924 KB Output is correct
5 Correct 2 ms 3796 KB Output is correct
6 Correct 2 ms 3540 KB Output is correct
7 Correct 2 ms 3284 KB Output is correct
8 Correct 2 ms 3028 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 0 ms 320 KB Output is correct
6 Correct 1 ms 444 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 444 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 340 KB Output is correct
13 Correct 1 ms 448 KB Output is correct
14 Correct 0 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct

Subtask #3
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 80 ms 76400 KB Output is correct
2 Correct 65 ms 54152 KB Output is correct
3 Correct 85 ms 61408 KB Output is correct
4 Correct 108 ms 121904 KB Output is correct
5 Correct 61 ms 51156 KB Output is correct
6 Correct 124 ms 126900 KB Output is correct
7 Correct 50 ms 33156 KB Output is correct
8 Correct 78 ms 60400 KB Output is correct
9 Correct 5 ms 7124 KB Output is correct
10 Correct 67 ms 55148 KB Output is correct

Subtask #4
61.0 / 61.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4564 KB Output is correct
2 Correct 2 ms 4436 KB Output is correct
3 Correct 2 ms 4180 KB Output is correct
4 Correct 2 ms 3924 KB Output is correct
5 Correct 2 ms 3796 KB Output is correct
6 Correct 2 ms 3540 KB Output is correct
7 Correct 2 ms 3284 KB Output is correct
8 Correct 2 ms 3028 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 0 ms 320 KB Output is correct
14 Correct 1 ms 444 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 444 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 0 ms 340 KB Output is correct
21 Correct 1 ms 448 KB Output is correct
22 Correct 0 ms 468 KB Output is correct
23 Correct 1 ms 468 KB Output is correct
24 Correct 80 ms 76400 KB Output is correct
25 Correct 65 ms 54152 KB Output is correct
26 Correct 85 ms 61408 KB Output is correct
27 Correct 108 ms 121904 KB Output is correct
28 Correct 61 ms 51156 KB Output is correct
29 Correct 124 ms 126900 KB Output is correct
30 Correct 50 ms 33156 KB Output is correct
31 Correct 78 ms 60400 KB Output is correct
32 Correct 5 ms 7124 KB Output is correct
33 Correct 67 ms 55148 KB Output is correct
34 Correct 94 ms 93004 KB Output is correct
35 Correct 43 ms 34788 KB Output is correct
36 Correct 65 ms 54388 KB Output is correct
37 Correct 48 ms 117256 KB Output is correct
38 Correct 20 ms 18352 KB Output is correct
39 Correct 92 ms 102888 KB Output is correct
40 Correct 19 ms 16084 KB Output is correct
41 Correct 76 ms 68656 KB Output is correct
42 Correct 90 ms 87472 KB Output is correct
43 Correct 92 ms 87532 KB Output is correct
44 Correct 94 ms 102100 KB Output is correct
45 Correct 39 ms 31812 KB Output is correct
46 Correct 79 ms 80456 KB Output is correct
47 Correct 93 ms 85212 KB Output is correct
48 Correct 68 ms 50388 KB Output is correct
49 Correct 4 ms 6996 KB Output is correct
50 Correct 109 ms 97804 KB Output is correct
51 Correct 54 ms 46148 KB Output is correct
52 Correct 58 ms 49052 KB Output is correct
53 Correct 107 ms 118552 KB Output is correct
54 Correct 41 ms 34660 KB Output is correct
55 Correct 97 ms 95156 KB Output is correct
56 Correct 114 ms 108152 KB Output is correct
57 Correct 16 ms 14932 KB Output is correct
58 Correct 88 ms 84832 KB Output is correct