Compilare: main.cpp: In function 'int main()': main.cpp:12:23: warning: format '%s' expects argument of type 'char*', but argument 3 has type 'char (*)[1000010]' [-Wformat=] fscanf(fin,"%s",&v); ^ main.cpp:30:11: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] st[k]=NULL; ^~~~ main.cpp:10:10: warning: unused variable 'ch' [-Wunused-variable] char ch; ^~ main.cpp:11:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d\n",&n,&m); ^ main.cpp:12:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%s",&v); ^