Compilare: user.cpp: In function ‘int main()’: user.cpp:12:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=2;i<=n;i++) ^ user.cpp:19:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=m;i++) ^ user.cpp:25:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=m;j++) ^ user.cpp:31:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x%r==0 || u[x]==r) ^ user.cpp:45:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=m;j++) ^ user.cpp:46:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(u[i]==p[n][j]) ^ user.cpp:58:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp:63:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp:9:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%u%ld",&n,&s); ^