Compilare: In file included from /usr/include/c++/4.8/cassert:43:0, from user.cpp:5: user.cpp: In function ‘int main()’: user.cpp:62:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(sol.size() <= m); ^ user.cpp:45:5: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i, x, y; i < n; i++) { ^