Compilare: user.cpp: In function ‘int main()’: user.cpp:20:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=2;i<=n;i++) ^ user.cpp:22:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=i;j++) ^ user.cpp:29:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=m;i++) ^ user.cpp:72:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=j;i++) ^ user.cpp:75:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp:78:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=i;j++) ^ user.cpp:81:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp:83:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=i;j++) ^ user.cpp:18:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%u%ld",&n,&s); ^