0_0_17334991_28141.cpp: In function 'void set()':
0_0_17334991_28141.cpp:13:21: error: 'strcpy' was not declared in this scope
strcpy(ch[0], "");
^
0_0_17334991_28141.cpp: In function 'void dfs(std::string, int, int)':
0_0_17334991_28141.cpp:38:23: error: 'strlen' was not declared in this scope
int len=strlen(ch[k]);
^
0_0_17334991_28141.cpp: In function 'int main()':
0_0_17334991_28141.cpp:78:24: error: 'strlen' was not declared in this scope
for(i=0;i<strlen(str)-1;i++)
^
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