Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:36:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vec[u].size(); i++) { ~~^~~~~~~~~~~~~~~ main.cpp:57:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vec[u].size(); i++) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:85:28: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=] printf("%d\n", dp[0][1]); ^ main.cpp:70:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("karb2.in", "r", stdin); ^ main.cpp:71:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("karb2.out", "w", stdout); ^ main.cpp:72:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ main.cpp:75:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ main.cpp:80:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^