Compilare: main.cpp: In function 'int isomorph(int, int)': main.cpp:105:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(match(A[a].size() - 1, B[b].size() - 1) == B[b].size() - 1) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void init()': main.cpp:153:39: warning: iteration 505 invokes undefined behavior [-Waggressive-loop-optimizations] Fa[i] = Fb[i] = Wa[i] = Wb[i] = 0; ~~~~~~^~~ main.cpp:150:22: note: within this loop for(int i = 0; i <= NMax + 5; i++) { ~~^~~~~~~~~~~