Compilare: user.cpp: In function ‘void doDijkstra()’: user.cpp:32:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < g[crt].size() ; ++i) ^ user.cpp: In function ‘bool check(int, int, int)’: user.cpp:61:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < g[crt].size() ; ++i) ^ user.cpp: In function ‘void compress()’: user.cpp:79:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < g[i].size() ; ++j) ^