foo.c: In function 'main':
foo.c:7:16: warning: variable 'b' set but not used [-Wunused-but-set-variable]
7 | int i,j,k,n,a,b;
| ^
foo.c:7:10: warning: unused variable 'k' [-Wunused-variable]
7 | int i,j,k,n,a,b;
| ^
foo.c:8:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
8 | scanf("%d", &n);
| ^~~~~~~~~~~~~~~
foo.c:11:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
11 | scanf("%d", &s[i][0]);
| ^~~~~~~~~~~~~~~~~~~~~
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