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Submission #26092

# Submission time Handle Problem Language Result Execution time Memory
26092 2017-06-27T13:46:12 Z Extazy Palindrome-Free Numbers (BOI13_numbers) C++14
100 / 100
 0 ms 2172 KB 
#include <bits/stdc++.h>

using namespace std;

long long a,b;
bool used[22][2][10][10][2][2];
long long state[22][2][10][10][2][2];
int d[22],cnt;

int get_digits(long long n) {
    cnt=0;
    while(n) d[cnt++]=n%10,n/=10;
    reverse(d,d+cnt);
}

long long recurse(int pos, int f, int before_last, int last, int has_before_last, int has_last) {
    if(pos==cnt) return has_last;
    if(used[pos][f][before_last][last][has_before_last][has_last]) return state[pos][f][before_last][last][has_before_last][has_last];
    long long ans=0;
    int i;
    for(i=0;i<10;i++) {
        if(f || i<=d[pos]) if(!has_last || last!=i) if(!has_before_last || before_last!=i) {
            ans+=recurse(pos+1,f|(i<d[pos]),last,i,has_last,has_last|(i>0));
        }
    }
    used[pos][f][before_last][last][has_before_last][has_last]=true;
    state[pos][f][before_last][last][has_before_last][has_last]=ans;
    return ans;
}

long long f(long long n) {
    get_digits(n);
    memset(used,0,sizeof(used));
    return 1+recurse(0,0,0,0,0,0);
}

int main() {
    scanf("%lld %lld", &a, &b);
    printf("%lld\n", f(b)-((a==0) ? 0 : f(a-1)));
}

Compilation message

numbers.cpp: In function 'int get_digits(long long int)':
numbers.cpp:14:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
numbers.cpp: In function 'int main()':
numbers.cpp:38:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld %lld", &a, &b);
                               ^

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2172 KB Output is correct
2 Correct 0 ms 2172 KB Output is correct
3 Correct 0 ms 2172 KB Output is correct
4 Correct 0 ms 2172 KB Output is correct
5 Correct 0 ms 2172 KB Output is correct
6 Correct 0 ms 2172 KB Output is correct
7 Correct 0 ms 2172 KB Output is correct
8 Correct 0 ms 2172 KB Output is correct
9 Correct 0 ms 2172 KB Output is correct
10 Correct 0 ms 2172 KB Output is correct
11 Correct 0 ms 2172 KB Output is correct
12 Correct 0 ms 2172 KB Output is correct
13 Correct 0 ms 2172 KB Output is correct
14 Correct 0 ms 2172 KB Output is correct
15 Correct 0 ms 2172 KB Output is correct
16 Correct 0 ms 2172 KB Output is correct
17 Correct 0 ms 2172 KB Output is correct
18 Correct 0 ms 2172 KB Output is correct
19 Correct 0 ms 2172 KB Output is correct
20 Correct 0 ms 2172 KB Output is correct

Subtask #2
75.0 / 75.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2172 KB Output is correct
2 Correct 0 ms 2172 KB Output is correct
3 Correct 0 ms 2172 KB Output is correct
4 Correct 0 ms 2172 KB Output is correct
5 Correct 0 ms 2172 KB Output is correct
6 Correct 0 ms 2172 KB Output is correct
7 Correct 0 ms 2172 KB Output is correct
8 Correct 0 ms 2172 KB Output is correct
9 Correct 0 ms 2172 KB Output is correct
10 Correct 0 ms 2172 KB Output is correct
11 Correct 0 ms 2172 KB Output is correct
12 Correct 0 ms 2172 KB Output is correct
13 Correct 0 ms 2172 KB Output is correct
14 Correct 0 ms 2172 KB Output is correct
15 Correct 0 ms 2172 KB Output is correct
16 Correct 0 ms 2172 KB Output is correct
17 Correct 0 ms 2172 KB Output is correct
18 Correct 0 ms 2172 KB Output is correct
19 Correct 0 ms 2172 KB Output is correct
20 Correct 0 ms 2172 KB Output is correct
21 Correct 0 ms 2172 KB Output is correct
22 Correct 0 ms 2172 KB Output is correct
23 Correct 0 ms 2172 KB Output is correct
24 Correct 0 ms 2172 KB Output is correct
25 Correct 0 ms 2172 KB Output is correct
26 Correct 0 ms 2172 KB Output is correct
27 Correct 0 ms 2172 KB Output is correct
28 Correct 0 ms 2172 KB Output is correct
29 Correct 0 ms 2172 KB Output is correct
30 Correct 0 ms 2172 KB Output is correct
31 Correct 0 ms 2172 KB Output is correct
32 Correct 0 ms 2172 KB Output is correct
33 Correct 0 ms 2172 KB Output is correct
34 Correct 0 ms 2172 KB Output is correct
35 Correct 0 ms 2172 KB Output is correct
36 Correct 0 ms 2172 KB Output is correct
37 Correct 0 ms 2172 KB Output is correct
38 Correct 0 ms 2172 KB Output is correct
39 Correct 0 ms 2172 KB Output is correct
40 Correct 0 ms 2172 KB Output is correct
41 Correct 0 ms 2172 KB Output is correct
42 Correct 0 ms 2172 KB Output is correct
43 Correct 0 ms 2172 KB Output is correct
44 Correct 0 ms 2172 KB Output is correct
45 Correct 0 ms 2172 KB Output is correct