geppetto.cpp: In function 'void fun(int, int)':
geppetto.cpp:17:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j=0;j<v[i].size();j++){
~^~~~~~~~~~~~
geppetto.cpp: In function 'int main()':
geppetto.cpp:31:26: warning: format '%lld' expects argument of type 'long long int*', but argument 2 has type 'int*' [-Wformat=]
scanf("%lld %lld",&a,&b);
~~ ^
geppetto.cpp:31:26: warning: format '%lld' expects argument of type 'long long int*', but argument 3 has type 'int*' [-Wformat=]
geppetto.cpp:31:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%lld %lld",&a,&b);
~~~~~^~~~~~~~~~~~~~~~~~~