Compilare: main.cpp: In function 'int flow(int, int)': main.cpp:35:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;st[nr]<v[nr].size();st[nr]++) ~~~~~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:63:31: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while(nr1=flow(1,1<<29)) ^