Compilare: main.c: In function 'main': main.c:22:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i=1;i<=n;++i) ^~~ main.c:25:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' B(1),printf("%d",b); ^ main.c:21:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("flip.in","r",stdin),freopen("flip.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:21:34: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("flip.in","r",stdin),freopen("flip.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:21:65: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("flip.in","r",stdin),freopen("flip.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~ main.c:24:13: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]),s[j]+=a[i][j]; ^~~~~~~~~~~~~~~~~~~~