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 'int main()': main.cpp:61:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < graph[2 * n + 1].size ( ); i++ ){ ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:82:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0; j < graph[i].size ( ); j++ ){ ~~^~~~~~~~~~~~~~~~~~~