Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < G[u].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int, int)': main.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < G[u].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp:32:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < G[u].size() ; i ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:43:17: warning: unused variable 'j' [-Wunused-variable] int n , i , j , x , y , sef , ok , ans , s; ^ main.cpp:43:35: warning: unused variable 'ok' [-Wunused-variable] int n , i , j , x , y , sef , ok , ans , s; ^~ main.cpp:43:40: warning: unused variable 'ans' [-Wunused-variable] int n , i , j , x , y , sef , ok , ans , s; ^~~ main.cpp:43:46: warning: unused variable 's' [-Wunused-variable] int n , i , j , x , y , sef , ok , ans , s; ^ main.cpp:41:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("iepuri2.in" , "r" , stdin); ^ main.cpp:42:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("iepuri2.out" , "w" , stdout); ^ main.cpp:44:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &n , &k); ^ main.cpp:47:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &x , &y); ^ main.cpp:59:11: warning: 'sef' may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d\n" , d[sef][1]); ~~~~~~^~~~~~~~~~~~~~~~~~~~