Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(z=0; z<L[k].size(); z++) ^ user.cpp: In function ‘void dfs_verif(int, int, int, int)’: user.cpp:28:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(z=0; z<L[k].size(); z++) ^ user.cpp: In function ‘int main()’: user.cpp:45:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("petrica.in","r",stdin); ^ user.cpp:46:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("petrica.out","w",stdout); ^ user.cpp:47:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:49:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ user.cpp:51:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&m[i].x,&m[i].y); ^ user.cpp:92:13: warning: ‘sum3’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(sum2>sum3) ^ user.cpp:105:13: warning: ‘nr_nod3’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nr_nod3==1) ^ user.cpp:111:47: warning: ‘rad3’ may be used uninitialized in this function [-Wmaybe-uninitialized] dfs_verif(sum1,sum2,rad3,rad3); ^ user.cpp:86:13: warning: ‘sum2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(sum1>sum2) ^ user.cpp:106:17: warning: ‘nr_nod1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nr_nod2==1) ^ user.cpp:107:51: warning: ‘rad1’ may be used uninitialized in this function [-Wmaybe-uninitialized] dfs_verif(sum2,sum3,rad1,rad1); ^ user.cpp:86:13: warning: ‘sum1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(sum1>sum2) ^