void make_graph()
{
	for (int i = 1; i <= K + C; i++)
		for (int j = 1; j <= K + C; j++)
			if (adj[i][j] <= ans) f[i][j] = 1;
                           else f[i][j] = 0;
	for (int i = 1; i <= K; i++) f[i][t] = M, f[t][i] = 0;
	for (int i = K + 1; i <= K + C; i++) f[s][i] = 1, f[i][s] = 0;
}
这样就WA了……
void make_graph()
{
	memset(f, 0, sizeof(f));
	for (int i = K + 1; i <= K + C; i++)
		for (int j = 1; j <= K; j++)
			if (adj[i][j] <= ans) f[i][j] = 1;
	for (int i = 1; i <= K; i++) f[i][t] = M;
	for (int i = K + 1; i <= K + C; i++) f[s][i] = 1;
}
这样就AC了……