/in/foo.cc: In function 'int main()':
/in/foo.cc:27:10: error: 'strcmp' was not declared in this scope
   27 |     if (!strcmp(temp, a[j])) {//如果找到了
      |          ^~~~~~
/in/foo.cc:2:1: note: 'strcmp' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | char a[1000][1000];//每一维记录人名
/in/foo.cc:34:5: error: 'strcpy' was not declared in this scope
   34 |     strcpy(a[cnt], temp);
      |     ^~~~~~
/in/foo.cc:34:5: note: 'strcpy' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
/in/foo.cc:42:7: error: 'strlen' was not declared in this scope
   42 |   if (strlen(a[i]) > 20)continue;
      |       ^~~~~~
/in/foo.cc:42:7: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
/in/foo.cc:44:4: error: 'strcpy' was not declared in this scope
   44 |    strcpy(t[houxuan], a[i]);
      |    ^~~~~~
/in/foo.cc:44:4: note: 'strcpy' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
/in/foo.cc:50:8: error: 'strlen' was not declared in this scope
   50 |    if (strlen(t[i]) > strlen(t[j])) {
      |        ^~~~~~
/in/foo.cc:50:8: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
/in/foo.cc:52:5: error: 'strcpy' was not declared in this scope
   52 |     strcpy(q, t[i]);
      |     ^~~~~~
/in/foo.cc:52:5: note: 'strcpy' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
/in/foo.cc:60:16: error: 'strlen' was not declared in this scope
   60 |   for (j = i; (strlen(t[j]) == strlen(t[i])); j++);
      |                ^~~~~~
/in/foo.cc:60:16: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
/in/foo.cc:64:9: error: 'strcmp' was not declared in this scope
   64 |     if (strcmp(t[k], t[z]) > 0) {
      |         ^~~~~~
/in/foo.cc:64:9: note: 'strcmp' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
/in/foo.cc:66:6: error: 'strcpy' was not declared in this scope
   66 |      strcpy(q, t[k]);
      |      ^~~~~~
/in/foo.cc:66:6: note: 'strcpy' is defined in header '<cstring>'; did you forget to '#include <cstring>'?