Compilare: user.cpp: In function ‘int main()’: user.cpp:98:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < E[t1][t2].size() && j < c[t1][t2] - r[t1][t2]; ++ j) ^ user.cpp:77:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^ user.cpp:84:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &t1, &t2); ^