HDU 3555 Bomb 【数位dp】
2016-10-06 14:00
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Bomb
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 131072/65536 K (Java/Others)Total Submission(s): 15876 Accepted Submission(s): 5794
Problem Description
The counter-terrorists found a time bomb in the dust. But this time the terrorists improve on the time bomb. The number sequence of the time bomb counts from 1 to N. If the current number sequence includes the sub-sequence "49", the power of the blast would
add one point.
Now the counter-terrorist knows the number N. They want to know the final points of the power. Can you help them?
Input
The first line of input consists of an integer T (1 <= T <= 10000), indicating the number of test cases. For each test case, there will be an integer N (1 <= N <= 2^63-1) as the description.
The input terminates by end of file marker.
Output
For each test case, output an integer indicating the final points of the power.
Sample Input
3
1
50
500
Sample Output
0
1
15
HintFrom 1 to 500, the numbers that include the sub-sequence "49" are "49","149","249","349","449","490","491","492","493","494","495","496","497","498","499",
so the answer is 15.
Author
fatboy_cw@WHU
Source
2010
ACM-ICPC Multi-University Training Contest(12)——Host by WHU
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zhouzeyong | We have carefully selected several similar problems for you: 3554 3556 3557 3558 3559
求从1~n中含有49的数字的个数。
#include <map> #include <set> #include <cstdio> #include <cstring> #include <algorithm> #include <queue> #include <iostream> #include <stack> #include <cmath> #include <string> #include <vector> #include <cstdlib> //#include <bits/stdc++.h> //#define LOACL #define space " " using namespace std; //typedef long long LL; typedef __int64 Int; typedef pair<int, int> paii; const int INF = 0x3f3f3f3f; const double ESP = 1e-5; const double PI = acos(-1.0); const int MOD = 1e9 + 7; const int MAXN = 1e5 + 10; Int dp[20][3]; void init() { dp[0][2] = 1; for (int i = 1; i < 20; i++) { dp[i][0] = dp[i - 1][0]*10 + dp[i - 1][1]; //含有49的 dp[i][1] = dp[i - 1][2]; //不含有49, 最高位是9 dp[i][2] = dp[i - 1][2]*10 - dp[i - 1][1]; //不含49(高位可为9) } } void solved(Int x) { int bit[20]; int p = 0; Int ans = 0; while (x) {bit[++p] = x%10; x /= 10;} bit[p + 1] = 0; bool flag = false; for (int i = p; i >= 1; i--) { ans += bit[i]*dp[i - 1][0]; if (flag) {ans += dp[i - 1][2]*bit[i]; continue;} //高位已经出现过49,下次跳过,以免重复。 if (bit[i] > 4) ans += dp[i - 1][1]; //最高位可以出现49 if (bit[i + 1] == 4 && bit[i] == 9) flag = true; } if (flag) ans++; printf("%I64d\n", ans); } int main() { Int T, n; init(); scanf("%I64d", &T); while (T--) { scanf("%I64d", &n); solved(n); } return 0; }
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