题解 | #统计字符#

/**
Input:
awq
p`rreuhmgf$o_mtjfkjc&kv_#gudn(&wjtu!z`&lkh+p))e)ags!)#&ecosk)om* n^wiz
Output:
3
0
0
0
47
1
0
22
 */
#include <iostream>
#include <vector>
using namespace std;

class Solution {
public:
  void stat(const string& s, vector<size_t>& a) {
    size_t len = s.length();
    int code = 0;
    a[0] = a[1] = a[2] = a[3] = 0;
    for (size_t i = 0; i < len; i++) {
      code = s.at(i);
      if (('A'<=code && code<='Z')|| ('a'<=code && code<='z')) {
    a[0] += 1;
      } else if (' ' == code) {
    a[1] += 1;
      } else if ('0'<=code && code<='9') {
    a[2] += 1;
      } else {
    a[3] += 1;
      }
    }
  }
};

int main() {
  Solution solution;
  vector<size_t> sum(4, 0);
  int c = 0;
  string s = "";
  for (;;) {
    c = cin.get();
    if (c == EOF) {
      break;
    }

    if (c=='\r' || c=='\n') {
      solution.stat(s, sum);
      for (auto it = sum.begin(); it != sum.end(); ++it) {
    cout << *it << "\n";
      }
      s = "";
    } else {
      s.append(1, c);
    }
  }
}
// 64 位输出请用 printf("%lld")