Compilare: user.cpp: In function ‘int dp(int)’: user.cpp:39:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < adj[0][x].size() ; i++){ ^ user.cpp:45:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < adj[0][x].size() ; i++){ ^ user.cpp: In function ‘void bfs(int, int)’: user.cpp:59:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < adj[mode][u].size() ; i++){ ^ user.cpp: In function ‘int main()’: user.cpp:80:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("shuffle2.in","r",stdin); ^ user.cpp:81:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("shuffle2.out","w",stdout); ^ user.cpp:84:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:87:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&u,&v); ^