Compilare: user.cpp: In function ‘void compute_dp(int)’: user.cpp:48:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[node].path.size(); ++ i){ ^ user.cpp:58:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < G[son].path.size(); ++ j){ ^ user.cpp:59:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(k < G[node].path.size() && G[node].path[k] < G[son].path[j]) ^ user.cpp:75:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < G[node].path.size(); ++ j) ^ user.cpp: In function ‘void read()’: user.cpp:21:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:23:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &u, &v); ^ user.cpp: In function ‘void solve()’: user.cpp:85:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &M); ^ user.cpp:87:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &a, &b, &cost[++ cost[0]]); ^