Compilare: user.cpp: In function ‘void DFSA(int)’: user.cpp:19:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<A[node].size();i++) ^ user.cpp: In function ‘void DFSB(int)’: user.cpp:31:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<B[node].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:98:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<nodesA[level].size();i++) ^ user.cpp:99:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<nodesB[level].size();j++){ ^ user.cpp:114:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(s=0;s<A[nodeA].size();s++) ^ user.cpp:115:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(t=0;t<B[nodeB].size();t++) ^ user.cpp:58:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sakura.in","r",stdin); ^ user.cpp:59:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sakura.out","w",stdout); ^ user.cpp:61:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&tests); ^ user.cpp:63:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:69:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp:75:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&m); ^ user.cpp:81:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^