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Bicoloring
10004.c
#include <stdio.h> #include <string.h> int n,l; int arr[205][205]; int col[205]; void colorea(void) { int i,j; while (1) { int done = 1; for (i=0; i<n; i++) { if (col[i] == 0) { done=0; } if (col[i] != 0) { for (j=0; j<n; j++) { if (arr[i][j]) { if (!col[j]) { col[j] = (col[i] ^ 1); } if (col[j] != (col[i] ^ 1)) { printf("NOT BICOLORABLE.\n"); return; } } } } } if (done) { printf("BICOLORABLE.\n"); return; } } } int main(void) { int a,b; int i; while (1) { scanf("%d %d", &n, &l); if (n==0) { return 0; } memset(arr, 0, sizeof(arr)); memset(col, 0, sizeof(col)); for (i=0; i<l; i++) { scanf("%d %d", &a, &b); arr[a][b] = arr[b][a] = 1; } col[0] = 2; colorea(); } }