Compilare: main.cpp: In function 'bool calc_dist(int, int, int)': main.cpp:34:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( j < g[i].size () && dst[g[i][j]] + cst[i][j] >= dst[i] ) ~~^~~~~~~~~~~~~~ main.cpp:41:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( j < g[i].size () || ex == 0 ) ~~^~~~~~~~~~~~~~