Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:36:42: warning: unused variable ‘cost’ [-Wunused-variable] int son = edge.x, dist = edge.d, cost = edge.c; ^ user.cpp: In function ‘int main()’: user.cpp:46:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:49:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &u, &v, &d, &c); ^