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"Distinct Subsequences"

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Lines changed: 1 addition & 1 deletion

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@@ -185,7 +185,7 @@ The `☢` means that you need to have a LeetCode Premium Subscription.
`185`	`185`	`\| 118 \| [Pascal's Triangle] \| [C](src/118.c) \|`
`186`	`186`	`\| 117 \| [Populating Next Right Pointers in Each Node II] \| \|`
`187`	`187`	`\| 116 \| [Populating Next Right Pointers in Each Node] \| [C](src/116.c) \|`
`188`		`-\| 115 \| [Distinct Subsequences] \| \|`
	`188`	`+\| 115 \| [Distinct Subsequences] \| [C](src/115.c) \|`
`189`	`189`	`\| 114 \| [Flatten Binary Tree to Linked List] \| [C](src/114.c) \|`
`190`	`190`	`\| 113 \| [Path Sum II] \| [C++](src/113.cpp) \|`
`191`	`191`	`\| 112 \| [Path Sum] \| [C](src/112.c) \|`

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`@@ -0,0 +1,50 @@`
	`1`	`+#include <stdio.h>`
	`2`	`+#include <stdlib.h>`
	`3`	`+#include <string.h>`
	`4`	`+#include <assert.h>`
	`5`	`+`
	`6`	`+int numDistinct(char* s, char* t) {`
	`7`	`+ if (s == NULL \|\| t == NULL) return 0;`
	`8`	`+ int n = strlen(s);`
	`9`	`+ int m = strlen(t);`
	`10`	`+`
	`11`	`+ int (dp)[n] = (int ()[n])calloc(n * m, sizeof(int));`
	`12`	`+ int i, j;`
	`13`	`+`
	`14`	`+ dp[0][0] = (t[0] == s[0] ? 1 : 0);`
	`15`	`+`
	`16`	`+ for (j = 1; j < n; j++) {`
	`17`	`+ dp[0][j] = dp[0][j - 1] + (t[0] == s[j] ? 1 : 0);`
	`18`	`+ }`
	`19`	`+`
	`20`	`+ for (i = 1; i < m; i++) {`
	`21`	`+ dp[i][0] = 0;`
	`22`	`+ }`
	`23`	`+`
	`24`	`+ for (i = 1; i < m; i++) {`
	`25`	`+ for (j = 1; j < n; j++) {`
	`26`	`+ if (t[i] == s[j]) {`
	`27`	`+ dp[i][j] = dp[i][j - 1] + dp[i - 1][j - 1];`
	`28`	`+ }`
	`29`	`+ else {`
	`30`	`+ dp[i][j] = dp[i][j - 1];`
	`31`	`+ }`
	`32`	`+ }`
	`33`	`+ }`
	`34`	`+`
	`35`	`+ int ans = dp[m - 1][n - 1];`
	`36`	`+ free(dp);`
	`37`	`+`
	`38`	`+ return ans;`
	`39`	`+}`
	`40`	`+`
	`41`	`+int main() {`
	`42`	`+ char s[] = "acaaca";`
	`43`	`+ char t[] = "ca";`
	`44`	`+`
	`45`	`+ assert(numDistinct(s, t) == 4);`
	`46`	`+`
	`47`	`+ printf("all tests passed!\n");`
	`48`	`+`
	`49`	`+ return 0;`
	`50`	`+}`

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