Compilare: user.cpp: In function ‘int main()’: user.cpp:12:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<n;i++) ^ user.cpp:13:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<m;j++)fin>>a[i][j]; ^ user.cpp:14:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (r=0;r<(1<<m);r++) {ans=0; ^ user.cpp:15:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<n;i++){ ^ user.cpp:16:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (t=j=0;j<m;j++) if (r&(1<<j))t+=-a[i][j]; ^ user.cpp:20:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s>ans)ans=s;} ^ user.cpp:18:62: warning: ‘s’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (t>-t)s+=t; ^