Compilare: main.cpp: In function 'int main()': main.cpp:118:58: warning: right operand of comma operator has no effect [-Wunused-value] else update_aib(mp[op[i].pos]),skip[mp[op[i].pos]],skip[mp[op[i].pos]]=true; ~~~~~~~~~~~~~~~~~~^ main.cpp:114:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i=1;i<=n;++i) ^~~ main.cpp:124:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' return 0; ^~~~~~