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Add 0347-top-k-frequent-elements.c

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	`1`	`+// A structure to represent an element of the heap.`
	`2`	`+typedefstruct {`
	`3`	`+intnum;`
	`4`	`+intcount;`
	`5`	`+}Heap;`
	`6`	`+`
	`7`	`+staticintcompareHeap(constvoidx,constvoidy) {`
	`8`	`+return ((Heap)y)->count- ((Heap)x)->count;`
	`9`	`+}`
	`10`	`+`
	`11`	`+/**`
	`12`	`+ * Note: The returned array must be malloced, assume caller calls free().`
	`13`	`+ */`
	`14`	`+inttopKFrequent(intnums,intnumsSize,intk,int*returnSize){`
	`15`	`+inthash[20001]= {0};`
	`16`	`+Heap*heap;`
	`17`	`+int*res;`
	`18`	`+inti,j;`
	`19`	`+intc=0;`
	`20`	`+`
	`21`	`+for (i=0;i<numsSize;i++) {`
	`22`	`+hash[nums[i]+10000]++;`
	`23`	`+if (hash[nums[i]+10000]) {`
	`24`	`+c++;`
	`25`	`+ }`
	`26`	`+ }`
	`27`	`+`
	`28`	`+heap= (Heap)malloc(sizeof(Heap)c);`
	`29`	`+memset(heap,0,sizeof(Heap)*c);`
	`30`	`+`
	`31`	`+c=0;`
	`32`	`+for (i=0;i<20001;i++) {`
	`33`	`+if(hash[i]>0) {`
	`34`	`+heap[c].num=i-10000;`
	`35`	`+heap[c].count=hash[i];`
	`36`	`+c++;`
	`37`	`+ }`
	`38`	`+ }`
	`39`	`+qsort(heap,c,sizeof(Heap),compareHeap);`
	`40`	`+`
	`41`	`+c=0;`
	`42`	`+res= (int)malloc(sizeof(int)k);`
	`43`	`+for (i=0;i<k;i++) {`
	`44`	`+res[c++]=heap[i].num;`
	`45`	`+ }`
	`46`	`+`
	`47`	`+*returnSize=c;`
	`48`	`+returnres;`
	`49`	`+}`

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