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// 2924. Find Champion II
#include "leetcode.h"
/*
* there are 'n' teams numbered from 0 to 'n - 1' in a tournament; each team is
* also a node in DAG. you are given the integer 'n' and a 0-indexed 2d integer
* array 'edges' of length 'm' representing the DAG, where 'edges[i] = [u_i,
* v_i]' indicates that is a directed edge from team 'u_i' to team 'v_i' in the
* graph. a directed edge from 'a' to 'b' in the graph means that team 'a' is
* strong than team 'b' and team 'b' is weaker than team 'a'. return the team
* that will be the champion of the tournament if there is a unique champion,
* otherwise return -1.
*/
int findChampion(int n, int **edges, int edgesSize, int *edgesColSize) {
char state[n];
memset(state, 'w', sizeof(state));
for (int i = 0; i < edgesSize; i++)
state[edges[i][1]] = 'l';
int cnt = 0, ans = 0;
for (int i = 0; i < n; i++)
if (state[i] == 'w') {
cnt++;
ans = i;
}
return cnt == 1 ? ans : -1;
}
int main() {
int e1i[2][2] = {{0, 1}, {1, 2}}, e2i[3][2] = {{0, 2}, {1, 3}, {1, 2}};
struct two_d_arr e1, e2;
two_d_arr_init(&e1, 2, 2, e1i);
two_d_arr_init(&e2, 3, 2, e2i);
printf("%d\n", findChampion(3, e1.arr, e1.row_size, e1.col_size)); // expect:
// 0
printf("%d\n",
findChampion(4, e2.arr, e2.row_size, e2.col_size)); // expect: -1
two_d_arr_free(&e1);
two_d_arr_free(&e2);
}
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