CodeForces 721B Passwords (水题)
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题意:给定 n 个密码,你要按长度不递减的顺序进行尝试,问你最多和最少试多少次可能找出密码,每尝试 k 次错误的,就要等5秒。
析:我们只要把长度全都统计下来,然后从1开始去找目标长度,最少的就是正好到目标长度,最多的就是把目标长度恰好试完。
代码如下:
#pragma comment(linker, "/STACK:1024000000,1024000000") #include <cstdio> #include <string> #include <cstdlib> #include <cmath> #include <iostream> #include <cstring> #include <set> #include <queue> #include <algorithm> #include <vector> #include <map> #include <cctype> #include <cmath> #include <stack> //#include <tr1/unordered_map> #define freopenr freopen("in.txt", "r", stdin) #define freopenw freopen("out.txt", "w", stdout) using namespace std; //using namespace std :: tr1; typedef long long LL; typedef pair<int, int> P; const int INF = 0x3f3f3f3f; const double inf = 0x3f3f3f3f3f3f; const LL LNF = 0x3f3f3f3f3f3f; const double PI = acos(-1.0); const double eps = 1e-8; const int maxn = 1e5 + 5; const LL mod = 10000000000007; const int N = 1e6 + 5; const int dr[] = {-1, 0, 1, 0, 1, 1, -1, -1}; const int dc[] = {0, 1, 0, -1, 1, -1, 1, -1}; const char *Hex[] = {"0000", "0001", "0010", "0011", "0100", "0101", "0110", "0111", "1000", "1001", "1010", "1011", "1100", "1101", "1110", "1111"}; inline LL gcd(LL a, LL b){ return b == 0 ? a : gcd(b, a%b); } int n, m; const int mon[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; const int monn[] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; inline int Min(int a, int b){ return a < b ? a : b; } inline int Max(int a, int b){ return a > b ? a : b; } inline LL Min(LL a, LL b){ return a < b ? a : b; } inline LL Max(LL a, LL b){ return a > b ? a : b; } inline bool is_in(int r, int c){ return r >= 0 && r < n && c >= 0 && c < m; } int a[105]; int main(){ while(scanf("%d %d", &n, &m) == 2){ string s; memset(a, 0, sizeof a); for(int i = 0; i < n; ++i){ cin >> s; ++a[s.size()]; } cin >> s; int cnt = s.size(); int ans1 = 1, ans2 = 0; for(int i = 1; i < cnt; ++i) ans1 += a[i]; ans2 = ans1 + a[cnt] - 1; ans1 += ((ans1-1) / m) * 5; ans2 += ((ans2-1) / m) * 5; printf("%d %d\n", ans1, ans2); } return 0; }
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