Compilare: user.cpp: In function ‘int main()’: user.cpp:48:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=m;i++) ^ user.cpp:54:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) ^ user.cpp:58:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) viz[i]=vizT[i]=false; ^ user.cpp:63:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) ^ user.cpp:76:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=nrLinii;i++) ^ user.cpp:78:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=mat[i][0];j++) printf("%d ",mat[i][j]); ^ user.cpp:45:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.in","r",stdin); ^ user.cpp:46:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.out","w",stdout); ^ user.cpp:47:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:50:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^