Compilare: user.cpp: In function ‘void bfs()’: user.cpp:25:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<gr[fr].size();i++) ^ user.cpp: In function ‘void bfs2()’: user.cpp:45:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<gr[fr].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:82:20: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(ap[i]==1&&frc[cost[i]]==1||i==x||i==y) ^