Compilare: main.cpp: In function 'int main()': main.cpp:64:33: warning: narrowing conversion of '(((int)n) - ((int)v.std::vector<_Tp, _Alloc>::at<item, std::allocator<item> >(1ul).item::heads))' from 'int' to 'short int' inside { } [-Wnarrowing] PQ.push({1, v.at(1).time, n - v.at(1).heads}); ~~^~~~~~~~~~~~~~~ main.cpp:78:48: warning: narrowing conversion of '(((int)save.heap::time) + ((int)v.std::vector<_Tp, _Alloc>::at<item, std::allocator<item> >(((std::vector<item>::size_type)it)).item::time))' from 'int' to 'short int' inside { } [-Wnarrowing] PQ.push({it, save.time + v.at(it).time, save.heads - v.at(it).heads}); ~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:78:76: warning: narrowing conversion of '(((int)save.heap::heads) - ((int)v.std::vector<_Tp, _Alloc>::at<item, std::allocator<item> >(((std::vector<item>::size_type)it)).item::heads))' from 'int' to 'short int' inside { } [-Wnarrowing] PQ.push({it, save.time + v.at(it).time, save.heads - v.at(it).heads}); ~~~~~~~~~~~^~~~~~~~~~~~~~~~ main.cpp:81:23: warning: second operand of conditional expression has no effect [-Wunused-value] fout << ans?ans:-1; ^ main.cpp:81:23: warning: third operand of conditional expression has no effect [-Wunused-value]