Compilare: main.cpp: In function 'int main()': main.cpp:30:11: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] *p=NULL; ^~~~ main.cpp: In function 'void rezolva(char*, long int&, long int&)': main.cpp:61:18: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] {p[l-1]=NULL; ^~~~ main.cpp: In function 'int main()': main.cpp:24:21: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &n); ^ main.cpp:27:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%s", s1); ^