foo.c: In function 'knapsack':
foo.c:14:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &w[i], &t);
         ^~~~~~~~~~~~~~~~~~~~~~~~~
foo.c: In function 'main':
foo.c:39:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &T, &M);
     ^~~~~~~~~~~~~~~~~~~~~~

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