Compilare: main.cpp:1:0: warning: ignoring #pragma region GCC_CP_Directives [-Wunknown-pragmas] #pragma region GCC_CP_Directives main.cpp:7:0: warning: ignoring #pragma OPTIMIZE1 [-Wunknown-pragmas] #pragma OPTIMIZE1 main.cpp:8:0: warning: ignoring #pragma OPTIMIZE2 [-Wunknown-pragmas] #pragma OPTIMIZE2 main.cpp:9:0: warning: ignoring #pragma OPTIMIZE3 [-Wunknown-pragmas] #pragma OPTIMIZE3 main.cpp:15:0: warning: ignoring #pragma endregion GCC_CP_Directives [-Wunknown-pragmas] #pragma endregion GCC_CP_Directives main.cpp:17:0: warning: ignoring #pragma comment [-Wunknown-pragmas] #pragma comment(linker, "/STACK:256000000") 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:19: main.cpp: In function 'void solve()': main.cpp:64:28: warning: assuming signed overflow does not occur when assuming that (X + c) >= X is always true [-Wstrict-overflow] assert(1 <= source && source <= n); ^