Compilare: main.cpp: In function 'void read()': main.cpp:15:15: warning: unused variable 'ok' [-Wunused-variable] int x, y, ok = 1; ^~ main.cpp: In function 'int DFS(int, int)': main.cpp:27:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Gph[node].size(); i++){ ~~^~~~~~~~~~~~~~~~~~ main.cpp:33:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'void read()': main.cpp:14:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &N, &D); ^ main.cpp:17:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^ main.cpp: In function 'int main()': main.cpp:37:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tairos.in", "r", stdin); ^ main.cpp:38:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tairos.out", "w", stdout); ^