Compilare: main.cpp: In function 'void DBG(std::vector<std::vector<int> >&)': main.cpp:11:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (int x : stk[0]) cerr << x << ' '; cerr << endl; ^~~ main.cpp:11:42: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for (int x : stk[0]) cerr << x << ' '; cerr << endl; ^~~~ main.cpp:13:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (int x : stk[1]) cerr << x << ' '; cerr << endl; ^~~ main.cpp:13:42: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for (int x : stk[1]) cerr << x << ' '; cerr << endl; ^~~~ main.cpp:15:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (int x : stk[2]) cerr << x << ' '; cerr << endl; ^~~ main.cpp:15:42: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for (int x : stk[2]) cerr << x << ' '; cerr << endl; ^~~~ In file included from /usr/include/c++/6/cassert:44:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:33, from main.cpp:1: main.cpp: In function 'void Sort(int, int, int, int, int, std::vector<std::vector<int> >&, std::vector<int>&)': main.cpp:45:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(stk[from].size() >= it_from); ~~~~~~~~~~~~~~~~~^~~~ main.cpp:46:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(stk[aux].size() >= it_aux); ~~~~~~~~~~~~~~~~^~~~