Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:30:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < V[x].size(); ++ i) ^ user.cpp: In function ‘void solve()’: user.cpp:44:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < V[ts[i]].size(); ++ j) ^ user.cpp:56:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < V[ts[i]].size(); ++ j) ^ user.cpp:61:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < V[ts[i]].size(); ++ j) ^ user.cpp: In function ‘void read()’: user.cpp:16:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:21:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^ user.cpp: In function ‘void write()’: user.cpp:70:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &k); ^ user.cpp:72:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &M[i]); ^ user.cpp: In function ‘int main()’: user.cpp:90:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^