oj.uz

Submission #129821

# Submission time Handle Problem Language Result Execution time Memory
129821 2019-07-13T09:56:36 Z pzdba Ljetopica (COI19_ljetopica) C++14
17 / 100
 44 ms 31864 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int mod = 1e9+7;
char s[1002], a[1002], b[1002];
ll dp[1002][1002][2], cnt[1002][1002][2];
int n, k;

int dfs(char *t){
    if(s[1] == '0') return 0;

    memset(dp, 0, sizeof(dp));
    memset(cnt, 0, sizeof(cnt));

    dp[1][0][0] = 1;
    cnt[1][0][0] = 1;

    dp[1][0][1] = 1;
    cnt[1][0][1] = 1;
    for(int i=2;i<=n;i++){
        for(int j=0;j<=k;j++){
            if(s[i] == 'L'){
                dp[i][j][0] = (dp[i][j][0] + dp[i-1][j][0]*2)%mod;
                cnt[i][j][0] = (cnt[i][j][0] + cnt[i-1][j][0])%mod;

                dp[i][j][1] = (dp[i][j][1] + dp[i-1][j][1]*2 + cnt[i-1][j][1])%mod;
                cnt[i][j][1] = (cnt[i][j][1] + cnt[i-1][j][1])%mod;

                if(j != k){
                    dp[i][j+1][1] = (dp[i][j+1][1] + dp[i-1][j][0]*2 + cnt[i-1][j][0])%mod;
                    cnt[i][j+1][1] = (cnt[i][j+1][1] + cnt[i-1][j][0])%mod;

                    dp[i][j+1][0] = (dp[i][j+1][0] + dp[i-1][j][1]*2)%mod;
                    cnt[i][j+1][0] = (cnt[i][j+1][0] + cnt[i-1][j][1])%mod;
                }
            }
            else{
                dp[i][j][0] = (dp[i][j][0] + dp[i-1][j][0]*2 + cnt[i-1][j][0])%mod;
                cnt[i][j][0] = (cnt[i][j][0] + cnt[i-1][j][0])%mod;

                dp[i][j][1] = (dp[i][j][1] + dp[i-1][j][1]*2)%mod;
                cnt[i][j][1] = (cnt[i][j][1] + cnt[i-1][j][1])%mod;

                if(j != k){
                    dp[i][j+1][1] = (dp[i][j+1][1] + dp[i-1][j][0]*2)%mod;
                    cnt[i][j+1][1] = (cnt[i][j+1][1] + cnt[i-1][j][0])%mod;

                    dp[i][j+1][0] = (dp[i][j+1][0] + dp[i-1][j][1]*2 + cnt[i-1][j][1])%mod;
                    cnt[i][j+1][0] = (cnt[i][j+1][0] + cnt[i-1][j][1])%mod;
                }
            }
        }
    }
    return (dp[n][k][0] + dp[n][k][1])%mod;
}

int main(){
    scanf("%d%d", &n, &k);
    scanf("%s", s+2);    
    scanf("%s", a+1);
    scanf("%s", b+1);

    for(int i=n;i>=1;i--){
        if(a[i] == '1'){
            a[i] = '0';
            for(int j=i+1;j<=n;j++) a[j] = '1';
            break;
        }
    }

    int res1 = dfs(a);
    // int res2 = dfs(b);
    int res2 = 0;

    printf("%d\n", (res1 - res2 + mod)%mod);
}

Compilation message

ljetopica.cpp: In function 'int main()':
ljetopica.cpp:58:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~
ljetopica.cpp:59:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s", s+2);    
     ~~~~~^~~~~~~~~~~
ljetopica.cpp:60:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s", a+1);
     ~~~~~^~~~~~~~~~~
ljetopica.cpp:61:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s", b+1);
     ~~~~~^~~~~~~~~~~

Subtask #1
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 28 ms 31736 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 28 ms 31864 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 31736 KB Output is correct
2 Correct 41 ms 31736 KB Output is correct
3 Correct 42 ms 31736 KB Output is correct
4 Correct 43 ms 31796 KB Output is correct
5 Correct 35 ms 31864 KB Output is correct
6 Correct 44 ms 31832 KB Output is correct
7 Correct 42 ms 31744 KB Output is correct
8 Correct 36 ms 31736 KB Output is correct
9 Correct 29 ms 31856 KB Output is correct
10 Correct 35 ms 31736 KB Output is correct

Subtask #4
0 / 61.0

# Verdict Execution time Memory Grader output
1 Incorrect 28 ms 31736 KB Output isn't correct
2 Halted 0 ms 0 KB -