Compilare: main.cpp: In function 'int main()': main.cpp:76:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j < V[i].size(); ++ j) ~~^~~~~~~~~~~~~ main.cpp:63:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:67:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &u, &v); ^