Compilare: main.cpp: In function 'int cb(int, int)': main.cpp:27:9: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized] return pos; ^~~ main.cpp: In function 'int main()': main.cpp:45:26: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized] update[j].pb(make_pair(val, p)); ~~~~~~~~~^~~~~~~~