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-rw-r--r--max_num_int_choose_range1.c38
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+// 2554. Maximum Number of Integers to Choose From a Range I
+#include "leetcode.h"
+
+/*
+ * you are given an integer array 'banned' and two integers 'n' and a 'maxSum'.
+ * you are choosing some number of integers following the below rules: the
+ * chosen integers have to be in the range '[1, n]', each integer can be chosen
+ * at most once, the chosen integers should not be in the array 'banned', and
+ * the sum of the chosen ntegers should not exceed 'maxSum'. return the maximum
+ * number of integers you can choose following the mentioned rules.
+ */
+
+int maxCount(int *banned, int bannedSize, int n, int maxSum) {
+ bool *valid = (bool *)malloc((n + 1) * sizeof(bool));
+ memset(valid + 1, true, n * sizeof(bool));
+ for (int i = 0; i < bannedSize; i++) {
+ if (!(banned[i] >= 1 && banned[i] <= n))
+ continue;
+ valid[banned[i]] = false;
+ }
+ int cnt = 0, curr_sum = 0;
+ for (int i = 1; i <= n; i++) {
+ if (!valid[i])
+ continue;
+ if (!(curr_sum + i <= maxSum))
+ break;
+ cnt++, curr_sum += i;
+ }
+ free(valid);
+ return cnt;
+}
+
+int main() {
+ int b1[] = {1, 6, 5}, b2[] = {1, 2, 3, 4, 5, 6, 7}, b3[] = {11};
+ printf("%d\n", maxCount(b1, ARRAY_SIZE(b1), 5, 6)); // expect: 2
+ printf("%d\n", maxCount(b2, ARRAY_SIZE(b2), 8, 1)); // expect: 0
+ printf("%d\n", maxCount(b3, ARRAY_SIZE(b3), 7, 50)); // expect: 7
+}