/*
$$$$$$$\ $$\ $$$$$$$\
$$ __$$\ \__| $$ __$$\
$$ | $$ | $$$$$$\ $$$$$$\ $$\ $$$$$$$\ $$ | $$ | $$$$$$\ $$$$$$\ $$$$$$$\ $$$$$$\
$$$$$$$\ |$$ __$$\ $$ __$$\ $$ |$$ _____|$$$$$$$\ | \____$$\ $$ __$$\ $$ _____|\____$$\
$$ __$$\ $$ / $$ |$$ | \__|$$ |\$$$$$$\ $$ __$$\ $$$$$$$ |$$ | \__|$$ / $$$$$$$ |
$$ | $$ |$$ | $$ |$$ | $$ | \____$$\ $$ | $$ |$$ __$$ |$$ | $$ | $$ __$$ |
$$$$$$$ |\$$$$$$ |$$ | $$ |$$$$$$$ |$$$$$$$ |\$$$$$$$ |$$ | \$$$$$$$\\$$$$$$$ |
\_______/ \______/ \__| \__|\_______/ \_______/ \_______|\__| \_______|\_______|
*/
#include <bits/stdc++.h>
using namespace std;
#define PB push_back
#define MP make_pair
#define INS insert
#define LB lower_bound
#define UB upper_bound
#define pii pair <int,int>
#define pll pair <long long, long long>
#define si pair<string, int>
#define is pair<int, string>
#define X first
#define Y second
#define _ << " " <<
#define sz(x) (int)x.size()
#define all(a) (a).begin(),(a).end()
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define FORD(i, a, b) for (int i = (a); i > (b); --i)
#define FORR(i, l, r) for (int i = (l); i <= (r); ++i)
#define FORP(i, a, b) for ((i) = (a); (i) < (b); ++i)
#define FORA(i, x) for (auto &i : x)
#define REP(i, n) FOR(i, 0, n)
#define BITS(x) __builtin_popcount(x)
#define MSET memset
#define MCPY memcpy
#define SQ(a) (a) * (a)
#define TRACE(x) cout << #x " = " << (x) << '\n';
#define YES cout << "YES\n"
#define NO cout << "NO\n"
typedef long long ll;
typedef long double ld;
typedef vector <int> vi;
typedef vector <pii> vpi;
typedef vector <ll> vll;
typedef vector <pll> vpl;
typedef vector <double> vd;
typedef vector <ld> vld;
typedef vector<si> vsi;
typedef vector<is> vis;
typedef vector<string> vs;
//((float) t)/CLOCKS_PER_SEC
const int MOD = 1e9 + 7;
const double PI = acos(-1);
const int INF = 1e9 + 10;
const ll INFL = 1e18 + 10;
const int ABC = 30;
const int dx[] = {-1, 1, 0, 0};
const int dy[] = {0, 0, -1, 1};
const int dox[] = {-1, 1, 0, 0, -1, -1, 1, 1};
const int doy[] = {0, 0, -1, 1, -1, 1, -1, 1};
inline int sum(int a, int b){
if (a + b < 0)
return (a + b + MOD) % MOD;
return (a + b) % MOD;
}
inline void add(int &a, int b){
a = sum(a, b);
}
inline int mul(int a, int b){
return (ll)a * (ll)b % MOD;
}
inline int sub(int a, int b){
return (a - b + MOD) % MOD;
}
inline int fast_pot(ll pot, int n){
ll ret = 1;
while (n){
if (n & 1)
ret = (ret * pot) % MOD;
pot = (pot * pot) % MOD;
n >>= 1;
}
return ret;
}
inline int divide(int a, int b){
return mul(a, fast_pot(b, MOD - 2));
}
ll lcm(ll a, ll b){
return abs(a * b) / __gcd(a, b);
}
inline double ccw(pii A, pii B, pii C){
return (A.X * B.Y) - (A.Y * B.X) + (B.X * C.Y) - (B.Y * C.X) + (C.X * A.Y) - (C.Y * A.X);
}
inline int CCW(pii A, pii B, pii C){
double val = ccw(A, B, C);
double eps = max(max(abs(A.X), abs(A.Y)), max(max(abs(B.X), abs(B.Y)), max(abs(C.X), abs(C.Y)))) / 1e9;
if (val <= -eps)
return -1;
if (val >= eps)
return 1;
return 0;
}
void to_upper(string &x){
REP(i, sz(x))
x[i] = toupper(x[i]);
}
void to_lower(string &x){
REP(i, sz(x))
x[i] = tolower(x[i]);
}
string its(ll x){
if (x == 0)
return "0";
string ret = "";
while (x > 0){
ret += (x % 10) + '0';
x /= 10;
}
reverse(all(ret));
return ret;
}
ll sti(string s){
ll ret = 0;
REP(i, sz(s)){
ret *= 10;
ret += (s[i] - '0');
}
return ret;
}
const int N = 55;
const int K = 1505;
unordered_map <string, vi> m;
int n, k, memo[N][K];
vi e[N][K];
int dp(int i, int j){
if (i == 0)
return 1;
int &ret = memo[i][j];
if (~ret)
return ret;
ret = 0;
FORA(nxt, e[i][j])
add(ret, dp(i - 1, nxt));
return ret;
}
int main () {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin >> n >> k;
set <int> tmp;
REP(i, n){
REP(j, k){
string s; cin >> s;
m[s].PB(j);
if (i == 0)
continue;
string b = s.substr(0, i);
string k = s.substr(1, i);
FORA(x, m[b])
tmp.INS(x);
FORA(x, m[k])
tmp.INS(x);
FORA(x, tmp)
e[i][j].PB(x);
tmp.clear();
}
}
memset(memo, -1, sizeof memo);
int sol = 0;
REP(i, k)
add(sol, dp(n - 1, i));
cout << sol << '\n';
return 0;
}
Compilation message
trener.cpp: In function 'int fast_pot(ll, int)':
trener.cpp:87:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
if (n & 1)
^~
trener.cpp:89:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
pot = (pot * pot) % MOD;
^~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
2560 KB |
Output is correct |
| 2 |
Correct |
6 ms |
2560 KB |
Output is correct |
| 3 |
Correct |
6 ms |
2688 KB |
Output is correct |
| 4 |
Correct |
6 ms |
2688 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
4224 KB |
Output is correct |
| 2 |
Correct |
12 ms |
4156 KB |
Output is correct |
| 3 |
Correct |
12 ms |
4224 KB |
Output is correct |
| 4 |
Correct |
69 ms |
5240 KB |
Output is correct |
| 5 |
Correct |
13 ms |
3968 KB |
Output is correct |
| 6 |
Correct |
14 ms |
3968 KB |
Output is correct |
| 7 |
Correct |
75 ms |
5496 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
2560 KB |
Output is correct |
| 2 |
Correct |
6 ms |
2560 KB |
Output is correct |
| 3 |
Correct |
6 ms |
2688 KB |
Output is correct |
| 4 |
Correct |
6 ms |
2688 KB |
Output is correct |
| 5 |
Correct |
12 ms |
4224 KB |
Output is correct |
| 6 |
Correct |
12 ms |
4156 KB |
Output is correct |
| 7 |
Correct |
12 ms |
4224 KB |
Output is correct |
| 8 |
Correct |
69 ms |
5240 KB |
Output is correct |
| 9 |
Correct |
13 ms |
3968 KB |
Output is correct |
| 10 |
Correct |
14 ms |
3968 KB |
Output is correct |
| 11 |
Correct |
75 ms |
5496 KB |
Output is correct |
| 12 |
Correct |
156 ms |
27552 KB |
Output is correct |
| 13 |
Correct |
158 ms |
27576 KB |
Output is correct |
| 14 |
Correct |
155 ms |
27692 KB |
Output is correct |
| 15 |
Correct |
166 ms |
27836 KB |
Output is correct |
| 16 |
Execution timed out |
2099 ms |
85600 KB |
Time limit exceeded |
| 17 |
Halted |
0 ms |
0 KB |
- |
