Compilare: main.cpp: In function 'void dfs(int)': main.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i<v[s].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'void dfst(int)': main.cpp:33:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i<t[s].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'void bfs(int)': main.cpp:55:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i<cv[na].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:94:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j<v[i].size(); j++) ~^~~~~~~~~~~~