Compilare: main.cpp: In function 'int main()': main.cpp:54:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i+1<w.size();i++) ~~~^~~~~~~~~ main.cpp:58:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(!cost[a][b]) ^ main.cpp:64:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i+1<w.size();i++) ~~~^~~~~~~~~ main.cpp:73:37: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(flow[b][a]=cost[b][a]) ^