Compilare: main.cpp: In function 'bool bfs()': main.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < a[x].size(); i++) { ~~^~~~~~~~~~~~~ main.cpp: In function 'void bfs1(int, bool*)': main.cpp:67:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < a[x].size(); i++) { ~~^~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:80:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < a[n].size(); i++) { ~~^~~~~~~~~~~~~ main.cpp:78:23: warning: unused variable 'j' [-Wunused-variable] int i, flow, nod, j, x, y; ^ main.cpp: In function 'void output()': main.cpp:111:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < critice.size(); i++) ~~^~~~~~~~~~~~~~~~