Compilare: user.cpp: In function ‘int main()’: user.cpp:14:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp:16:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=m;j++) ^ user.cpp:23:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<m;j++) ^ user.cpp:43:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=m;j++) ^ user.cpp:45:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==p) ^ user.cpp:55:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=m;j++) ^ user.cpp:74:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=m;j++) ^ user.cpp:76:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==p) ^ user.cpp:84:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=2;j<=m;j++) ^ user.cpp:13:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ user.cpp:18:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a[i][j]); ^