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Submission #284639

# Submission time Handle Problem Language Result Execution time Memory
284639 2020-08-27T19:20:56 Z ChrisT Palindrome-Free Numbers (BOI13_numbers) C++17
100 / 100
 1 ms 512 KB 
#include <bits/stdc++.h>
using namespace std;
const int MN = 1e3 + 5;
long long dp[2][20][10][10]; //dp[<=][digit][last digit][2nd last digit]
long long solve (long long x) {
	long long ret = 0; memset(dp,0,sizeof dp);
	for (int i = 0; i < min(100LL,x+1); i++) if (i < 10 || i/10 != i%10){
		++ret;
		dp[0][0][i/10][i%10] = 1;
		if (i <= x % 100) dp[1][0][i/10][i%10] = 1;
	}
	if (x<100) return ret;
	x /= 100;
	for (int i = 1; x; i++, x /= 10) {
		for (int take = 0; take < 10; take++) {
			for (int lst = 0; lst < 10; lst++) if (lst != take) {
				for (int bef = 0; bef < 10; bef++) if (lst != bef && bef != take) {
					dp[0][i][take][lst] += dp[0][i-1][lst][bef];
					if (take == x%10) dp[1][i][take][lst] += dp[1][i-1][lst][bef];
					else if (take < x%10) dp[1][i][take][lst] += dp[0][i-1][lst][bef];
				}
				if (!take) continue;
				if (x>=10) ret += dp[0][i][take][lst];
				else ret += dp[1][i][take][lst];
			}
		}
	}
	return ret;
}
int main () {
	long long a,b;
	scanf ("%lld %lld",&a,&b);
	printf ("%lld\n",solve(b) - solve(a-1));
	return 0;
}

Compilation message

numbers.cpp: In function 'int main()':
numbers.cpp:32:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   32 |  scanf ("%lld %lld",&a,&b);
      |  ~~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 512 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 0 ms 384 KB Output is correct
13 Correct 0 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 1 ms 384 KB Output is correct

Subtask #2
75.0 / 75.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 372 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 0 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 0 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 0 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 1 ms 384 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 1 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 1 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 1 ms 384 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Correct 1 ms 384 KB Output is correct
30 Correct 1 ms 384 KB Output is correct
31 Correct 1 ms 384 KB Output is correct
32 Correct 1 ms 384 KB Output is correct
33 Correct 1 ms 384 KB Output is correct
34 Correct 1 ms 384 KB Output is correct
35 Correct 1 ms 384 KB Output is correct
36 Correct 1 ms 384 KB Output is correct
37 Correct 1 ms 384 KB Output is correct
38 Correct 1 ms 384 KB Output is correct
39 Correct 1 ms 384 KB Output is correct
40 Correct 1 ms 384 KB Output is correct
41 Correct 1 ms 384 KB Output is correct
42 Correct 1 ms 384 KB Output is correct
43 Correct 0 ms 384 KB Output is correct
44 Correct 1 ms 384 KB Output is correct
45 Correct 1 ms 384 KB Output is correct