Compilare: main.cpp: In function 'void euler(int)': main.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( nv[nod] < g[nod].size() ) ~~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:24:63: warning: iteration 4 invokes undefined behavior [-Waggressive-loop-optimizations] bool incoord ( pii sz, pii crd, int i ) { return crd.fi + dx[i] >= 1 && crd.fi + dx[i] <= sz.fi && crd.se + dy[i] >= 1 && crd.se + dy[i] <= sz.se; } ~~~~^ main.cpp:91:22: note: within this loop for ( i = 0; i <= 4; i++ ) ~~^~~~