oj.uz

답안 #462164

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
462164 2021-08-10T08:24:29 Z AlexLuchianov PIN (CEOI10_pin) C++14
100 / 100
 33 ms 7628 KB 
#include <iostream>
#include <vector>
#include <algorithm>

using ll = long long;

int const sigma = 37;
int const nmax = sigma * sigma * sigma * sigma;
int frec[sigma][sigma][sigma][sigma];
ll dp[1 + 4];

int convert(char ch) {
  if('0' <= ch && ch <= '9')
    return ch - '0' + 1;
  else
    return ch - 'a' + 11;
}

int main() {
  int n, target;
  std::cin >> n >> target;
  for(int i = 1;i <= n; i++) {
    std::string s;
    std::cin >> s;
    int a = convert(s[0]), b = convert(s[1]), c = convert(s[2]), d = convert(s[3]);
    for(int mask = 0; mask < (1 << 4); mask++) {
      frec[a * (0 < (mask & (1 << 3)))][b * (0 < (mask & (1 << 2)))][c * (0 < (mask & (1 << 1)))][d * (0 < (mask & (1 << 0)))]++;
    }
  }
  for(int a = 0; a < sigma; a++)
    for(int b = 0; b < sigma; b++)
      for(int c = 0; c < sigma; c++)
        for(int d = 0; d < sigma; d++)
          dp[(a == 0) + (b == 0) + (c == 0) + (d == 0)] += 1LL * frec[a][b][c][d] * (frec[a][b][c][d] - 1) / 2;
  dp[2] -= dp[1] * 3;
  dp[3] -= dp[1] * 3;
  dp[3] -= dp[2] * 2;
  dp[4] -= dp[1];
  dp[4] -= dp[2];
  dp[4] -= dp[3];
  std::cout << dp[target];
  return 0;
}

Subtask #1
100.0 / 100.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 1740 KB Output is correct
2 Correct 8 ms 1856 KB Output is correct
3 Correct 7 ms 1828 KB Output is correct
4 Correct 13 ms 1864 KB Output is correct
5 Correct 14 ms 1868 KB Output is correct
6 Correct 17 ms 1864 KB Output is correct
7 Correct 13 ms 1860 KB Output is correct
8 Correct 16 ms 1860 KB Output is correct
9 Correct 21 ms 1868 KB Output is correct
10 Correct 22 ms 1864 KB Output is correct
11 Correct 16 ms 1872 KB Output is correct
12 Correct 24 ms 1868 KB Output is correct
13 Correct 18 ms 1868 KB Output is correct
14 Correct 18 ms 1864 KB Output is correct
15 Correct 23 ms 1864 KB Output is correct
16 Correct 23 ms 7500 KB Output is correct
17 Correct 33 ms 7620 KB Output is correct
18 Correct 33 ms 7616 KB Output is correct
19 Correct 25 ms 7628 KB Output is correct
20 Correct 29 ms 7628 KB Output is correct