Compilare: main.cpp: In function 'int main()': main.cpp:38:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < grafo[i].size(); j++) ~~^~~~~~~~~~~~~~~~~ main.cpp:46:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < grafo[i].size(); j++) ~~^~~~~~~~~~~~~~~~~ main.cpp:56:6: warning: unused variable 'ans' [-Wunused-variable] ll ans = 0; ^~~ main.cpp:23:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &q); ^ main.cpp:26:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &pai[i]); ^ main.cpp:29:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ main.cpp:54:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %lld", &u, &k); ^