Compilare: main.cpp: In function 'bool bfs(int)': main.cpp:21:26: warning: suggest parentheses around assignment used as truth value [-Wparentheses] viz[i] = tata[i] = 0; ~~~~~~~~^~~ main.cpp:27:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < graph[node].size ( ); i++ ){ ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void bfs2(int)': main.cpp:45:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < graph[node].size ( ); i++ ){ ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:65:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < graph[n].size ( ); i++ ){ ~~^~~~~~~~~~~~~~~~~~~ main.cpp:86:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0; j < graph[i].size ( ); j++ ){ ~~^~~~~~~~~~~~~~~~~~~