Compilare: main.cpp: In function 'void dfs(Trie*)': main.cpp:57:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<nod->adj.size(); i++){ ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:63:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("virus.in", "r", stdin); ^ main.cpp:64:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("virus.out", "w", stdout); ^ main.cpp:66:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &m, &n); ^ main.cpp:67:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", a); ^ main.cpp:69:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &k); ^ main.cpp:70:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^