Compilare: main.cpp: In function 'int flux()': main.cpp:44:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[d].size(); i++) { ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:96:16: warning: unused variable 'sum' [-Wunused-variable] int ans = 0, sum = flux(); ^~~