Compilare: main.cpp: In function 'void DFS(int, int)': main.cpp:57:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= L[node].size(); i++) { ~~^~~~~~~~~~~~~~~~~ main.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= L[node].size(); i++) { ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:92:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("defrisare.in", "r", stdin); ^ main.cpp:93:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("defrisare.out", "w", stdout); ^ main.cpp:97:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &N); ^ main.cpp:98:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for (i = 1; i <= N; i++) scanf ("%d", &h[i]); ^ main.cpp:100:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d", &X, &Y, &D); ^