foo.c: In function 'main':
foo.c:38:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &k);
     ^~~~~~~~~~~~~~~~~~~~~
foo.c:39:34: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     for (int i = 0; i < 10; ++i) scanf("%d", &e[i]);
                                  ^~~~~~~~~~~~~~~~~~
foo.c:40:34: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     for (int i = 0; i < n; ++i) {scanf("%d", &pep[i].w);pep[i].d = i + 1;}
                                  ^~~~~~~~~~~~~~~~~~~~~~

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